Difference between revisions of "Civilisation/Technology"

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Computing
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== Computing ==
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=== History of Computing ===
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1801
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Joseph Jacquard created a punch-card programmable loom which greatly simplified the weaving process.
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1837
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The Analytical Engine was a proposed mechanical general-purpose computer designed by English mathematician and computer pioneer Charles Babbage. It was first described in 1837 as the successor to Babbage's Difference Engine.
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1843
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Ada Lovelace, the daughter of Lord Byron, worked closely with Charles Babbage. She wrote a plan for how the Bernoulli numbers might be calculated, which is widely regarded as the first computer program.
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1936
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Alan Turing invented the Turing Machine, a mathematical model of computation describing an abstract machine that manipulates symbols on a strip of tape according to a table of rules. Computers to this day emulate this functionality of reading simple binary input and computing a logical output. This relatively simple machine enables the computation of any algorithm.
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 +
1944
  
 
The Colossus machines were electronic computing devices used by British codebreakers to read encrypted German messages during World War II. These were the world's first programmable, digital, electronic, computing devices. They used vacuum tubes (thermionic valves) to perform the calculations. Colossus was designed by engineer Tommy Flowers
 
The Colossus machines were electronic computing devices used by British codebreakers to read encrypted German messages during World War II. These were the world's first programmable, digital, electronic, computing devices. They used vacuum tubes (thermionic valves) to perform the calculations. Colossus was designed by engineer Tommy Flowers
  
−
ENIAC (Electronic Numerical Integrator And Computer) was the first general-purpose electronic computer. Designed for the US Army in 1946
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1946
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ENIAC (Electronic Numerical Integrator and Computer) was the first general-purpose electronic computer. It was designed for the US Army.
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1947
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William Shockley of Bell Labs invented the first transistor.
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1949
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EDSAC (Electronic Delay Storage Automatic Calculator) was constructed by Maurice Wilkes and his team at the University of Cambridge Mathematical Laboratory. Later the project was supported by J. Lyons & Co. Ltd., who were rewarded with the first commercially applied computer, LEO I (Lyons Electronic Office I), based on the EDSAC design.
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1951
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Ferranti Mark I was the world's first commercially available general-purpose electronic computer. The first machine was delivered to the University of Manchester in February 1951, just ahead of the UNIVAC (Universal Automatic Computer) which was delivered to the United States Census Bureau a month later.
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1958
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Jack Kilby and Robert Noyce created the first integrated circuit, commonly known as a microchip. An integrated circuit consists of electronic circuits mounted onto a semiconductor.
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1964
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The CDC 6600 was manufactured by Control Data Corporation. Generally considered to be the first successful supercomputer, it was designed by Seymour Cray.
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1964
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Douglas Engelbart invented the computer mouse. It was built of a wooden case with two wheels and a button on top.
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1969
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ARPANET was the first wide-area packet-switched network with distributed control. It was the precursor to the Internet.
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1971
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Intel released the first microprocessor, the 4-bit Intel 4004.
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1971
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Email was invented by Ray Tomlinson.
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1974
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The term “Internet” was first used.
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1975
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Microsoft was founded by Bill Gates and Paul Allen, to develop and sell BASIC interpreters for the Altair 8800.
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1976
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Apple-1 was released. It was an 8-bit computer designed by Steve Wozniak. To finance its creation, Steve Jobs sold his Volkswagen Bus, and Wozniak sold his HP-65 calculator. Production was discontinued in September 1977 after the introduction of its successor, the Apple II.
 +
 
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1981
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IBM launched its first personal computer, the IBM Model-5150.
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1982
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Sinclair ZX spectrum was released.
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 +
1984
 +
 
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Apple Mac was released.
 +
 
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1985
 +
 
 +
Microsoft released its first version of the Windows operating system.
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 +
1989
 +
 
 +
The World Wide Web was created by Tim Berners-Lee.
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 +
1990
 +
 
 +
Microsoft Office was released.
 +
 
 +
1995
 +
 
 +
Java programming language was developed by James Gosling of Sun Microsystems.
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 +
1998
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 +
Google was founded by Larry Page and Sergey Brin while they were PhD students at Stanford University.
 +
 
 +
1998
 +
 
 +
The first quantum computer was created.
 +
 
 +
2012
 +
 
 +
Raspberry Pi single-board computer was released at a cost of £35. By December 2019, a total of 30 million devices had been sold. It was designed for the teaching of basic computer science in schools but has also been used in commercial applications.
 +
 
 +
=== Personal Computers ===
 +
'''Altair 8800''' was the first commercially successful personal computer. It was advertised on the cover of Popular Electronics in January 1975 and was sold by mail order. It was designed by MITS (Micro Instrumentation and Telemetry Systems) and was based on the Intel 8080 processor.
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 +
'''Commodore PET''' was released in 1977 by Commodore International. It contained an 8-bit microprocessor and included a version of BASIC in read-only memory. PET was a backronym of Personal Electronic Transactor. 219,000 units were sold.
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 +
'''IBM Personal Computer''' (model 5150, commonly known as the IBM PC) was the first microcomputer released in the IBM PC model line. Based on the Intel 8088 microprocessor. The operating system was IBM PC DOS, developed by Microsoft. The starting price was US$1,565 (equivalent to $5,040 in 2022).
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'''Osborne 1''' was the first commercially successful portable computer. It was released in 1981 and weighed 11 kg. The microprocessor was a Zilog Z80 and the operating system was CP/M.
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'''BBC Micro''' was a series of microcomputers designed and built in the 1980s by Acorn Computers, headed by Hermann Hauser and Chris Curry, for the BBC Computer Literacy Project. The CPU was an 8-bit MOS Technology 6502 and the programming language was BBC BASIC. An accompanying 1982 television series, ''The Computer Programme'', featuring Chris Serle learning to use the machine, was broadcast on BBC2.
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'''ZX Spectrum''' was developed by Sinclair Research and was Britain's best-selling microcomputer, selling 5 million units. The initial cost of the 16 KB machine was £125. It was the successor to the ZX80 and ZX81 machines. The original ZX Spectrum had a rubber keyboard. The microprocessor was an 8-bit Z80. Sinclair licensed the Spectrum design to Timex Corporation in the United States.
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'''Commodore 64''' was an 8-bit computer released in 1982. It was the highest-selling single computer model of all time, with estimates placing the number sold between 12.5 and 17 million units. The machine took its name from its 64 kilobytes of RAM.
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 +
=== Operating Systems ===
 +
'''CP/M''' (Control Program for Microcomputers) was created in 1974 for Intel 8080/85-based microcomputers by Gary Kildall of Digital Research, Inc. It was widely used in business through the late 1970s and into the mid-1980s but was eventually displaced by DOS following the 1981 introduction of the IBM PC.
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'''MS-DOS''' (Microsoft Disk Operating System) is an operating system for x86-based personal computers. IBM PC DOS is a rebranded version of MS-DOS. In 1980 IBM approached Digital Research, at Bill Gates' suggestion, to license a forthcoming version of CP/M for its new product, the IBM Personal Computer. Upon the failure to obtain a signed non-disclosure agreement, the talks failed, and IBM instead contracted with Microsoft to provide an operating system. The resulting product, MS-DOS, soon began outselling CP/M.
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 +
'''Microsoft Windows''' is the most popular desktop operating system in the world, with a 70% market share.
 +
 
 +
<u>List of Microsoft Windows versions</u>
 +
{| class="wikitable"
 +
|Version
 +
|Release date
 +
|-
 +
|Windows 1.0
 +
|1985
 +
|-
 +
|Windows 2.0
 +
|1987
 +
|-
 +
|Windows 2.1x
 +
|1988
 +
|-
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|Windows 3.0
 +
|1990
 +
|-
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|Windows 3.1
 +
|1992
 +
|-
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|Windows NT 3.1
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|1993
 +
|-
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|Windows 3.2
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|1993
 +
|-
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|Windows NT 3.5
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|1994
 +
|-
 +
|Windows NT 3.51
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|1995
 +
|-
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|Windows 95
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|1995
 +
|-
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|Windows NT 4.0
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|1995
 +
|-
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|Windows 98
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|1998
 +
|-
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|Windows 2000
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|2000
 +
|-
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|Windows ME
 +
|2000
 +
|-
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|Windows XP
 +
|2001
 +
|-
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|Windows XP Professional x64 Edition
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|2005
 +
|-
 +
|Windows Vista
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|2007
 +
|-
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|Windows 7
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|2009
 +
|-
 +
|Windows 8
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|2012
 +
|-
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|Windows 8.1
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|2013
 +
|-
 +
|Windows 10
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|2015
 +
|-
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|Windows 11
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|2021
 +
|}
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Windows 1.0 replaced MS-DOS.
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Windows NT is a multiprocessing and multi-user operating system.
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 +
Windows 95 introduced the Start menu. The Windows 95 release included a commercial featuring The Rolling Stones' 1981 single "Start Me Up" (a reference to the Start button). Microsoft paid the Rolling Stones $3 million for the rights to “Start Me Up”. Windows 95 was bundled as a standalone operating system that did not require a separate DOS license.
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Windows ME (Millennium Edition) became infamously known by many as one of the worst versions of Windows ever released, mainly due to stability problems.
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Windows Vista received poor reviews, mainly for its much higher hardware requirements and perceived slowness compared to Windows XP.
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Windows 8 received a mostly negative reception. The new user interface of the operating system was widely criticized for being confusing and unintuitive.
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Windows 10 reintroduced the Start menu, and incorporated Microsoft's intelligent personal assistant, Cortana. Internet Explorer was replaced with Microsoft Edge.
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 +
'''Mac OS''' was developed for the Macintosh family of personal computers from 1984 to 2001, starting with System 1 and ending with Mac OS 9. The Macintosh operating system is credited with having popularized the graphical user interface concept.
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 +
macOS succeeded the classic Mac OS. In 1985 Apple cofounder Steve Jobs had left Apple and started another company, NeXT, developing the NeXTSTEP platform that would later be acquired by Apple to form the basis of macOS.
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 +
<u>List of macOS versions</u>
 +
{| class="wikitable"
 +
|Version
 +
|Release name
 +
|Release date
 +
|-
 +
|Mac OS X 10.0
 +
|Cheetah
 +
|2001
 +
|-
 +
|Mac OS X 10.1
 +
|Puma
 +
|2001
 +
|-
 +
|Mac OS X 10.2
 +
|Jaguar
 +
|2002
 +
|-
 +
|Mac OS X 10.3
 +
|Panther
 +
|2003
 +
|-
 +
|Mac OS X 10.4
 +
|Tiger
 +
|2005
 +
|-
 +
|Mac OS X 10.5
 +
|Leopard
 +
|2007
 +
|-
 +
|Mac OS X 10.6
 +
|Snow Leopard
 +
|2009
 +
|-
 +
|Mac OS X 10.7
 +
|Lion
 +
|2011
 +
|-
 +
|Mac OS X 10.8
 +
|Mountain Lion
 +
|2012
 +
|-
 +
|Mac OS X 10.9
 +
|Mavericks
 +
|2013
 +
|-
 +
|Mac OS X 10.10
 +
|Yosemite
 +
|2014
 +
|-
 +
|Mac OS X 10.11
 +
|El Capitan
 +
|2015
 +
|-
 +
|macOS 10.12
 +
|Sierra
 +
|2016
 +
|-
 +
|macOS 10.13
 +
|High Sierra
 +
|2017
 +
|-
 +
|macOS 10.14
 +
|Mojave
 +
|2018
 +
|-
 +
|macOS 10.15
 +
|Catalina
 +
|2019
 +
|-
 +
|macOS 11
 +
|Big Sur
 +
|2020
 +
|-
 +
|macOS 12
 +
|Monterey
 +
|2021
 +
|-
 +
|macOS 13
 +
|Ventura
 +
|2022
 +
|-
 +
|macOS 14
 +
|Sonoma
 +
|Announced on 5 June 2023
 +
|}
 +
'''Unix''' is a family of multi-user computer operating systems that derive from the original AT&T Unix, whose development was started in 1969 at the Bell Labs research centre by Kenneth Thompson and Dennis Ritchie.
 +
 
 +
Almost the entire operating system is written in the C programming language.
 +
 
 +
'''Linux''' is a family of open-source Unix-like operating systems based on the Linux kernel, an operating system kernel first released in 1991 by Finnish-American software engineer Linus Torvalds.
 +
 
 +
Popular Linux distributions include Debian, Fedora Linux, and Ubuntu. Commercial distributions include Red Hat Enterprise Linux and SUSE Linux Enterprise.
 +
 
 +
Tux is the penguin mascot of the Linux kernel, and is based on an image created by Larry Ewing in 1996.
 +
 
 +
'''ChromeOS''' is a Linux-based operating system developed and designed by Google. Laptops or tablets running ChromeOS are known as Chromebooks.
 +
 
 +
=== Programming languages ===
 +
'''FORTRAN''' (Formula Translation) was originally developed by IBM in the 1950s for scientific and engineering applications, and subsequently came to dominate scientific computing.
 +
 
 +
'''COBOL''' was designed in 1959 by CODASYL and was partly based on the programming language FLOW-MATIC designed by Grace Hopper. It was created as part of a US Department of Defense effort to create a portable programming language for data processing. It is primarily used in business, finance, and administrative systems.
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 +
'''BASIC''' (Beginners' All-purpose Symbolic Instruction Code) was created by John Kemeny and Thomas Kurtz at Dartmouth College in 1963. It became the de facto programming language for home computer systems that usually had a BASIC interpreter installed by default.
 +
 
 +
'''Pascal''' is a procedural programming language, designed by Niklaus Wirth and intended to encourage good programming practices using structured programming and data structuring. It is based on the ALGOL 60 language.
 +
 
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'''Ada''' is an object-oriented high-level programming language designed for the United States Department of Defense (DoD). Ada was named after Ada Lovelace.
 +
 
 +
'''C''' was developed by Dennis Ritchie between 1969 and 1973 at AT&T Bell Labs to construct utilities running on Unix. C is widely used for systems programming in implementing operating systems and embedded system applications.
 +
 
 +
'''C++''' was developed by Bjarne Stroustrup starting in 1979 at Bell Labs. It is as an extension of the C programming language and has object-oriented features.
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 +
'''C#''' is based on the C family of languages, and has similarities to C, C++, Java, and JavaScript. It was designed by Anders Hejlsberg from Microsoft in 2000.
 +
 
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'''Java''' is a high-level, object-oriented programming language used to create complete applications. The language is platform independent, allowing it to run on any device that supports its environment. Java was originally developed by James Gosling as a core component of Sun Microsystems' Java platform. The Java logo is a cup of coffee, and the mascot is a cartoon character named Duke.
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'''Python''' is a general-purpose programming language created by Dutch programmer Guido van Rossum and first released in 1991. Python's name is derived from the British comedy troupe Monty Python.
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'''Ruby''' was developed by Yukihiro "Matz" Matsumoto in Japan and released in 1995. It was designed with an emphasis on programming productivity and simplicity.
 +
 
 +
'''Go''' is an object-oriented programming language that Google created in 2009 for networking and infrastructure. It has evolved into a general-purpose language used in a wide range of applications.
 +
 
 +
'''Kotlin''' was designed by JetBrains, a company based in Prague. Kotlin is designed to interoperate fully with Java, and is used by Android app developers. The name comes from Kotlin Island, near Saint Petersburg.
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 +
'''R''' is an open-source programming language for statistical computing and data analysis.
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 +
'''JavaScript''' is a dynamic scripting language that is one of the core technologies of the World Wide Web. It was designed by Brendan Eich of Netscape and released in 1995.
 +
 
 +
'''PHP''' is a widely-used open source and general-purpose scripting language that is especially suited for web development. PHP’s popularity is owed to the fact that it was one of the first server-side languages that developers could embed into HTML. It was created by Rasmus Lerdorf in 1995. PHP was originally an abbreviation of Personal Home Page, but it now stands for the recursive initialism PHP: Hypertext Preprocessor.
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 +
== Computer security ==
 +
Types of attack –
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Malware ('malicious software') is any program or file that is harmful to a computer user. Malware can be divided into a number of types –
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 +
'''Virus''' - replicates itself by modifying other computer programs and inserting its own code into those programs. Once downloaded, opened or executed, the virus can piggyback onto programs to corrupt data.
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 +
'''Worm''' - a standalone program that replicates itself in order to spread to other computers. Creeper was the first computer worm, while Reaper was the first antivirus software, designed to eliminate Creeper. Reaper was created by Ray Tomlinson in 1972.
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 +
Stuxnet is a computer worm discovered in 2010. It initially spread via Microsoft Windows, and targeted Siemens industrial software and equipment. Different variants of Stuxnet targeted five Iranian organizations, with the probable target widely suspected to be uranium enrichment infrastructure in Iran.
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 +
'''Trojan horse''' - any malware that misleads users of its true intent by disguising itself as a standard program. It is unable to replicate itself.
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 +
'''Ransomware''' - comprises a class of malware which restricts access to the computer system that it infects, and demands a ransom paid to the creator of the malware in order for the restriction to be removed. Ransomware attacks are typically carried out using a Trojan disguised as a legitimate file that the user is tricked into downloading or opening when it arrives as an email attachment.
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 +
'''Rogue software''' - a form of malware and internet fraud that misleads users into believing there is a virus on their computer and aims to convince them to pay for a fake malware removal tool that actually installs malware on their computer.
 +
 
 +
'''Spyware''' - malware used to gain access to a user’s systems and monitor their data, files, and behavior. Spyware is frequently associated with advertising.
 +
 
 +
Terms used in connection with attacks –
 +
 
 +
'''Phishing''' – the fraudulent practice of sending emails purporting to be from reputable companies in order to induce individuals to reveal personal information, such as passwords and credit card numbers.
 +
 
 +
'''Smishing''' – similar to phishing, but the messages are sent via text messages rather than emails.
 +
 
 +
'''Vishing''' – similar to phishing, but the messages are sent via phone calls or voice mails rather than emails. Also known as voice phishing.
 +
 
 +
'''Whaling''' – a type of phishing attack where a particularly important person in an organisation is targeted.
 +
 
 +
'''Spoofing''' – a sort of fraud in which someone forges the sender’s identity and poses as a reputable source in order to obtain personal information, acquire money, spread malware, or steal data.
 +
 
 +
'''Doxing''' – short for "dropping dox," is an online attack in which hackers dig up personal information and documents – hence, the “dox” part of “dropping dox” – to expose the real identities of people hoping to remain anonymous.
 +
 
 +
'''Clickjacking''' – a malicious technique of tricking a user into clicking on something different from what the user perceives, thus potentially revealing confidential information.
 +
 
 +
'''Denial of service attack (DoS attack)''' – a cyber-attack in which the perpetrator seeks to make a machine or network resource unavailable to its intended users by temporarily or indefinitely disrupting services of a host connected to a network. In a distributed denial-of-service attack (DDoS attack), the incoming traffic flooding the victim originates from many different sources, and is usually performed by a group of Internet-connected devices known as a botnet (a portmanteau of the words "robot" and "network").
 +
 
 +
<u>Hackers</u>
 +
 
 +
A hacker is able to subvert computer security. If doing so for malicious purposes, the person can also be called a cracker. There are three types of hackers –
 +
 
 +
'''Black hat''' – someone who maliciously searches for and exploits vulnerabilities in computer systems or networks, often using malware and other hacking techniques to do harm.
 +
 
 +
'''White hat''' – a security specialist hired to find vulnerabilities in software, hardware and networks that black hats may find and target. Unlike black hats, white hats only hack networks when legally permitted to do so. Also known as ethical hackers.
 +
 
 +
'''Grey hat''' – someone who exploits security vulnerabilities without malicious intent, like a white hat, but may use illegal methods to find flaws.
 +
 
 +
<u>Anti-virus software</u>
 +
 
 +
'''Norton AntiVirus'''
 +
 
 +
Founded by Peter Norton, Norton AntiVirus has been developed and distributed by Symantec since 1990. The product runs on Microsoft Windows, Linux, and macOS.
 +
 
 +
The current Norton product, Norton 360, was developed by Gen Digital (formerly Symantec Corporation).
 +
 
 +
'''McAfee'''
 +
 
 +
John McAfee created VirusScan, the first commercial anti-virus software, in 1987.
 +
 
 +
In 2000, McAfee/Network Associates was the leading authority in educating and protecting people against the Love Bug or ILOVEYOU virus, one of the most destructive computer viruses in history.
 +
 
 +
Intel acquired McAfee in 2010.
 +
 
 +
'''Bitdefender'''
 +
 
 +
Bitdefender is a Romanian cybersecurity technology company headquartered in Bucharest. The company was founded in 2001 by the current CEO and main shareholder, Florin Talpes.
 +
 
 +
'''Kaspersky Anti-Virus'''
 +
 
 +
Kaspersky Lab is a Russian computer security company, co-founded by Natalia Kaspersky and Eugene Kaspersky in 1997, offering anti-virus, anti-spyware, anti-spam, and anti-intrusion products.
 +
 
 +
In 2016 the software has about 400 million users and had the largest market-share of cybersecurity software vendors in Europe.
 +
 
 +
The U.S. Department of Homeland Security banned Kaspersky products from all government departments in 2017.
 +
 
 +
'''Avast Antivirus'''
 +
 
 +
Avast was founded in Prague in 1988. The software is software are sold on a freemium model, where basic security features are free, but more advanced features require purchasing a premium version. The free version is also supported by ads.
 +
 
 +
In 2017 it had the largest share of the market for antivirus applications.
 +
 
 +
AVG was a cybersecurity software company founded in 1991 and it merged into Avast following an acquisition in 2017.
 +
 
 +
=== Cloud computing ===
 +
Cloud computing is the on-demand availability of computing resources, such as storage and infrastructure, as services over the internet. The market is currently dominated by Amazon Web Services, Microsoft Azure, and Google Cloud.
 +
 
 +
iCloud allows users to store data such as music files for download to multiple devices such as iPhones, iPods, iPads, and personal computers running Mac OS X or Microsoft Windows on computer servers owned by Apple
 +
 
 +
=== File hosting ===
 +
A file-hosting service is a hosting service on the internet that stores user data, like images, videos, and other types of data files. These services are secure and allow a user to store their files safely on the internet. Since the files are stored on the internet, they can be accessed from anywhere if the user has internet access.
 +
 
 +
Microsoft OneDrive is a file hosting service operated by Microsoft. First launched in 2007, it enables registered users to share and synchronize their files. OneDrive also works as the storage backend of the web version of Microsoft Office. OneDrive offers 5 GB of storage space free of charge.
 +
 
 +
=== Quantum computing ===
 +
A quantum computer is a device for computation that makes direct use of quantum mechanical phenomena, such as superposition and entanglement, to perform operations on data. Quantum computers are different from traditional computers based on transistors.
 +
 
 +
In quantum computing, a qubit or quantum bit is a unit of quantum information.
 +
 
 +
The field of quantum computing was initiated by the work of Paul Benioff and Yuri Manin in 1980, Richard Feynman in 1982, and David Deutsch in 1985.
 +
 
 +
IBM Quantum System One was the first commercial quantum computer.
 +
 
 +
It was hoped that a quantum computer could perform some calculations exponentially faster than any modern "classical" computer, but in 2023 classical computers outperform quantum computers for all real-world applications.
 +
 
 +
=== Office productivity software ===
 +
<u>Word processing</u>
 +
 
 +
'''WordPerfect''' was the dominant player in the word processor market in the 1980s. Following a failed release for Microsoft Windows, Microsoft Word took over the market.
 +
 
 +
'''Microsoft Word''' was first released in 1983 under the name Multi-Tool Word for Xenix systems. Commercial versions of Word are licensed as a standalone product or as a component of Microsoft Office. In the top menu, the icon for the save button is a floppy disk.
 +
 
 +
<u>Spreadsheet</u>
 +
 
 +
'''VisiCalc''' (visible calculator) was the first spreadsheet computer program for personal computers, originally released for the Apple II in 1979. When Lotus 1-2-3 was launched in 1983, taking full advantage of the expanded memory and screen of the PC, VisiCalc sales practically ended overnight.
 +
 
 +
'''Lotus 1-2-3''' was a state-of-the-art spreadsheet and the standard throughout the 1980s. Due to the lack of a graphical user interface Lotus was surpassed by Microsoft in the early 1990s and never recovered.
 +
 
 +
'''Microsoft Excel''' was launched in 1987. Excel was one of the first spreadsheet programs to use a graphical interface with pull down menus. The first version was only released for the Macintosh. It consists of 1048576 rows and 16384 columns, a row and column together make a cell.
 +
 
 +
<u>Presentation program</u>
 +
 
 +
'''Microsoft PowerPoint''' was created by Forethought, Inc. in 1987, initially for Macintosh computers only. Microsoft acquired PowerPoint three months after it appeared. PowerPoint was originally designed to provide visuals for group presentations within business organisations. PowerPoint's worldwide market share of presentation software is around 95%.
 +
 
 +
<u>Microsoft Office</u>
 +
 
 +
'''Office''' was first announced by Bill Gates in 1988, at COMDEX in Las Vegas. The first version of Office contained Word, Excel, and PowerPoint. Later versions included an email client (Outlook), a database management system (Access), and a desktop publishing app (Publisher). In Microsoft Office 2007, Calibri replaced Times New Roman as the default typeface in Word and replaced Arial as the default in PowerPoint, Excel, and Outlook. The branding Office 365 was first introduced in 2010 to refer to subscription-based software as a service platform for the corporate market. In October 2022, Microsoft announced that it would rebrand the product as "Microsoft 365".
 +
 
 +
=== Laptops ===
 +
'''Acer'''
 +
 
 +
Acer is a Taiwanese company founded in 1976.
 +
 
 +
Current models – Aspire, Chromebook, Spin, Swift.
 +
 
 +
'''Apple'''
 +
 
 +
The MacBook Air is Apple's least expensive notebook computer and was released in 2008. The MacBook Pro is Apple's higher-end notebook available in 13-inch, 14-inch, and 16-inch configurations and was released in 2006.
 +
 
 +
Current models – MacBook Pro, MacBook Air.
 +
 
 +
'''Asus'''
 +
 
 +
Asus is a Taiwanese company founded in 1989.
 +
 
 +
Current models – Chromebook, Flip, Zenbook.
 +
 
 +
'''Lenovo'''
 +
 
 +
Lenovo is a Chinese company founded as Legend in 1984, and acquired IBM's personal computer business in 2005, including the ThinkPad laptop. The IdeaPad line of laptops was introduced in 2008. Lenovo has been the world's largest PC vendor by unit sales in every year since 2013, with the exception of 2017.
 +
 
 +
Current models – IdeaPad.
 +
 
 +
'''Dell'''
 +
 
 +
Dell was founded by Michael Dell in 1984 and is the world's 3rd-largest PC vendor by unit sales. The first Inspiron laptop model was introduced in 1997.
 +
 
 +
Current models – Inspiron, XPS.
 +
 
 +
'''HP'''
 +
 
 +
HP Inc. was formerly known as Hewlett-Packard. It is the world's 2nd-largest PC vendor by unit sales.
 +
 
 +
Current models – Envy, Pavilion, Chromebook, ProBook.
 +
 
 +
'''Microsoft'''
 +
 
 +
Microsoft Surface is a series of touchscreen-based personal computers, tablets, and interactive whiteboards designed and developed by Microsoft, most of them running the Windows operating system. They are designed to be premium devices.
 +
 
 +
Current models – Surface.
 +
 
 +
=== Tablet computers ===
 +
A tablet is a mobile device, typically with a mobile operating system and touchscreen display processing circuitry, and a rechargeable battery.
 +
 
 +
A 2-in-1 PC is a hybrid or combination of a tablet and laptop computer that has features of both. Distinct from tablets, 2-in-1 PCs all have physical keyboards.
 +
 
 +
A phablet is a mobile device combining or straddling the size formats of smartphones and tablets. The Sony Xperia Z Ultra is a 2013 Android phablet designed and manufactured by Sony Mobile
 +
 
 +
Market share (2022) – Apple 37%, Samsung 18%, Amazon 11%
 +
 
 +
'''Apple'''
  
−
EDSAC (Electronic Delay Storage Automatic Calculator) was constructed by Maurice Wilkes and his team at the University of Cambridge Mathematical Laboratory. Later the project was supported by J. Lyons & Co. Ltd., who were rewarded with the first commercially applied computer, LEO I, based on the EDSAC design. EDSAC ran its first programs in1949
+
The iPad was released in 2010. It features a multi-touch screen and a virtual onscreen keyboard. The iOS operating system was switched to iPadOS in 2019. Total sales exceed 670 million units.
  
−
Ferranti Mark I was the world's first commercially available general- purpose electronic computer. The first machine was delivered to the University of Manchester in February 1951, just ahead of the UNIVAC which was delivered to the United States Census Bureau a month later
+
iPad range consists of the original iPad lineup and three other products –
  
−
Altair 8800 – first PC, designed in 1975
+
iPad Mini – a smaller tablet with screen sizes of 7.9 inches and 8.3 inches.
  
−
Flash memory (both NOR and NAND types) was invented by Dr. Fujio Masuoka while working for Toshiba in 1984
+
iPad Air – uses the Apple M1 chip.
  
−
Ray Tomlinson invented email and the @ sign in emails
+
iPad Pro – professional model with a screen size of 12.9 inches. Uses the Apple M2 chip.
  
−
Kenneth Thompson developed Unix
+
'''Amazon'''
  
−
Linus Torvalds developed Linux
+
The Amazon Fire is built with Quanta Computer in Taiwan. The Kindle Fire was first released in 2011, featuring a colour 7-inch multi-touch and running on Fire OS. In 2014, when the fourth generation was introduced, the name "Kindle" was dropped. In later generations, the Fire tablet is also able to convert into a Smart speaker with interaction by voice command through Alexa.
  
−
Tux – penguin mascot of the Linux kernel, based on an image created by Larry Ewing in 1996
+
'''Samsung'''
  
−
The Whetstone benchmark primarily measures the floating-point arithmetic performance. A similar benchmark for integer and string operations is the Dhrystone
+
The Samsung Galaxy Tab is a line of Android OS tablet computers first released in 2010.
  
−
Cloud computing – using multiple server computers via a digital network, as though they were one computer
+
=== Internet ===
 +
ARPANET (Advanced Research Projects Agency Network), created by the Defense Advanced Research Projects Agency (DARPA) of the United States Department of Defense, was the world's first operational packet switching network, and the predecessor of the contemporary global Internet. The packet switching of the ARPANET was based on designs by Lawrence Roberts, of the Lincoln Laboratory.
  
−
Duke – red-nosed mascot of Java
+
Internet protocol suite, commonly known as TCP/IP, is a framework for organizing the set of communication protocols used in the Internet. The foundational protocols in the suite are the Transmission Control Protocol (TCP), the User Datagram Protocol (UDP), and the Internet Protocol (IP).
  
−
CAPTCHA is a type of challenge-response test used in computing as an attempt to ensure that the response is not generated by a computer
+
Vinton Gray ‘Vint’ Cerf is an American Internet pioneer, who is recognized as one of ‘the fathers of the Internet’, sharing this title with Bob Kahn, for the invention of TCP/IP.
  
−
Malware – for 'malicious software', is any program or file that is harmful to a computer user
+
The Internet has no single centralized governance in either technological implementation or policies for access and usage; each constituent network sets its own policies. The overarching definitions of the two principal name spaces on the Internet, the Internet Protocol address (IP address) space and the Domain Name System (DNS), are directed by a maintainer organization, the Internet Corporation for Assigned Names and Numbers (ICANN).
  
−
Hector (High End Computing Terascale Resources) is capable of 63 million million calculations a second and is four times faster than its predecessor
+
Country code top-level domain (ccTLD) is an Internet top-level domain generally used or reserved for a country, sovereign state, or dependent territory identified with a country code.
  
−
Crumb – 2 bits, nibble – 4 bits
+
Internet of Things (IoT) is the network of physical objects or "things" embedded with electronics, software, sensors, and network connectivity, which enables these objects to collect and exchange data.
  
−
A Trojan horse cannot replicate itself, but a virus can
+
=== World Wide Web ===
 +
The World Wide Web, or Web, is an information system on the internet which allows documents to be connected to other documents by hypertext links, enabling the user to search for information by moving from one document to another.
  
−
APL is based on a mathematical notation developed by Kenneth E. Iverson
+
The Web was invented by Tim Berners-Lee at CERN in 1999. He also made the world’s first web browser and web server. The first website built (info.cern.ch) was at CERN, and was first put online on 6 August 1991.
  
−
Sprite – a two-dimensional image or animation that is integrated into a larger scene
+
'''HTML''' (Hyper Text Markup Language) – the publishing format for the web. It includes the ability to format documents and link to other documents and resources.
  
−
Rasterisation – the task of taking an image described in a vector graphics format (shapes) and converting it into a raster image (pixels or dots) for output on a video display or printer, or for storage in a bitmap file format
+
'''URL''' (Uniform Resource Locator) – a kind of 'address' that is unique to each resource on the web. It could be the address of a webpage or an image file.
  
−
Decision support system (DSS) is a computer-based information system that supports business or organizational decision-making activities. DSSs include knowledge-based systems
+
'''HTTP''' (Hypertext Transfer Protocol) – allows HTML documents to be requested and transmitted between browsers and web servers via the internet.
  
−
Disc – optical storage device
+
'''HTTPS''' (Hypertext Transfer Protocol Secure) – an extension of the Hypertext Transfer Protocol. It uses encryption for secure communication over a computer network, and is widely used on the Internet.
  
−
Disk – magnetic storage device
+
'''Web browser''' – a tool that enables users to surf and access websites that are on the internet.
  
−
Mosaic was developed at the National Center for Supercomputing Applications (NCSA) and released in 1993. First browser
+
'''Web server''' – a computer where files are stored which can be accessed via the internet using HTTP or HTTPS.
  
−
RSA is an algorithm for public-key cryptography
+
'''Web 2.0''' – the current state of the internet that has more user-generated content and usability for end-users than Web 1.0.
  
−
Quantum computer – a device for computation that makes direct use of quantum mechanical phenomena, such as superposition and entanglement, to perform operations on data. Quantum computers are different from traditional computers based on transistors
+
'''Cookie''' – a small piece of data sent from a website and stored on the user's computer by the user's web browser while the user is browsing.
  
−
In quantum computing, a qubit or quantum bit is a unit of quantum information
+
<u>Website development</u>
  
−
Shor's algorithm, named after mathematician Peter Shor, is a quantum algorithm for integer factorization formulated in 1994. It solves the following problem: Given an integer ''N'', find its prime factors
+
LAMP is an acronym for an archetypal model of web service solution stacks, originally consisting of largely interchangeable components:
  
−
Quantum cryptography is the use of quantum mechanical effects to perform cryptographic tasks or to break cryptographic systems, e.g. RSA
+
·          Linux operating system
  
−
Ransomware comprises a class of malware which restricts access to the computer system that it infects, and demands a ransom paid to the creator of the malware in order for the restriction to be removed
+
·          Apache HTTP Server
  
−
Mouseover – a section of a computer user-interface that is raised when the user moves or hovers the pointer over a particular area of the GUI
+
·          MySQL relational database management system
  
−
Genetic algorithm – a search heuristic that mimics the process of natural selection
+
·          PHP programming language
  
−
Neural networks – computational models inspired by animals' central nervous systems (in particular the brain) that are capable of machine learning and pattern recognition
+
The ‘P’ in Lamp can also stand for Python or Perl
  
−
Flash memory – an electronic non-volatile computer storage medium that can be electrically erased and reprogrammed
+
'''JavaScript''' is the dominant client-side scripting language of the Web, with 98% of all websites using it for this purpose. Scripts are embedded in or included from HTML documents. All major web browsers have a built-in JavaScript engine that executes the code on the user's device.
  
−
Blu-ray Disc refers to the blue laser used to read the disc, which allows information to be stored at a greater density than is possible with the longer-wavelength red laser used for DVDs
+
'''HTML''' is a markup language that web browsers use to interpret and compose text, images, and other material into visible or audible web pages.
  
−
Holographic data storage records information throughout the volume of the medium and is capable of recording multiple images in the same area utilizing light at different angles
+
'''XML''' (Extensible Markup Language) is a markup language and file format for storing, transmitting, and reconstructing arbitrary data.
  
−
C was developed by Dennis Ritchie between 1969 and 1973 at AT&T Bell Labs
+
'''CSS''' (Cascading Style Sheets) is a style sheet language used for describing the presentation of a document written in a markup language such as HTML or XML.
  
−
C++ was developed by Bjarne Stroustrup starting in 1979 at Bell Labs
+
'''Ruby on Rails''' is a server-side web application framework written in Ruby.
  
−
Octothorp – # key (number sign or hash)
+
'''WordPress''' is among the most popular content management systems. It is written in PHP.
  
−
A multi-core processor is a single computing component with two or more independent actual central processing units (called cores’), e.g. dual-core and quad-core
+
=== Companies ===
 +
'''Adobe Inc.''' was founded by John Warnock and Charles Geschke in 1982. Products include Adobe Photoshop image editing software, Adobe Illustrator vector-based illustration software, Adobe Acrobat Reader, and the Portable Document Format (PDF) that is based on the PostScript page description language.
  
−
Sasser is a computer worm that affects computers running vulnerable versions of Windows XP and Windows 2000. Sasser spreads by exploiting the system through a vulnerable network port
+
'''ARM''' was founded as Advanced RISC Machines, ARM, a joint venture between Acorn Computers, Apple Computer and VLSI Technology. Based in Cambridge, its primary business is the design of ARM processors (CPUs). Since 2016, it has been owned by Japanese conglomerate SoftBank Group.
  
−
Stuxnet is a computer worm discovered in 2010. It initially spreads via Microsoft Windows, and targets Siemens industrial software and equipment. Different variants of Stuxnet targeted five Iranian organizations, with the probable target widely suspected to be uranium enrichment infrastructure in Iran
+
'''Cisco Systems''' was founded in 1984 by Leonard Bosack and Sandy Lerner. John Chambers was CEO from 1995 to 2015. Cisco is known particularly for its networking hardware.
  
−
Helvetica is a widely used sans-serif typeface developed in 1957 by Swiss typeface designer Max Miedinger
+
'''Compaq''' was founded in 1982 and rose to become the largest supplier of PC systems during the 1990s before being overtaken by Dell in 2001. The company was acquired for US$25 billion by HP in 2002. The brand remained in use by HP for lower-end systems until 2013 when it was discontinued.
  
−
Serif, or Roman, typefaces are named for the features at the ends of their strokes
+
'''Hewlett-Packard''' (HP) was founded in 1939 by Bill Hewlett and David Packard. HP was the world's leading PC manufacturer from 2007 until 2013, when Lenovo moved ahead of HP. In 2015 the former Hewlett-Packard Company changed its name to HP Inc. and Hewlett Packard Enterprise was spun off as a newly created company.
  
−
In Microsoft Office 2007, Calibri replaced Times New Roman as the default typeface in Word and replaced Arial as the default in PowerPoint, Excel, and Outlook
+
'''Intel''' (From integrated and electronics) was founded in 1968. It is one of the world's largest semiconductor chip manufacturer by revenue, and is one of the developers of the x86 series of instruction sets found in most personal computers.
  
−
Arial typeface was designed in 1982 by Robin Nicholas and Patricia Saunders for Monotype Typography
+
The Intel 4004 chip was released by Intel in 1971. It was the first commercially available microprocessor by Intel.
  
−
Times New Roman is a serif typeface commissioned by the newspaper, The Times, in 1931, designed by Stanley Morison and Victor Lardent at the English branch of Monotype
+
The x86 family is based on the Intel 8086 microprocessor.
  
−
Lucida is an extended family of related typefaces designed by Charles Bigelow and Kris Holmes in 1985
+
'''International Business Machines Corporation (IBM)''' was founded in 1911 as the Computing-Tabulating-Recording Company. During the 1960s and 1970s, the IBM mainframe, exemplified by the System/360, was the dominant computing platform, and the company produced 80 percent of computers in the U.S. and 70 percent of computers worldwide. After pioneering the multipurpose microcomputer in the 1980s, IBM began losing its market dominance to emerging competitors.
  
−
Moore’s Law – the number of transistors that can be placed inexpensively on an integrated circuit doubles approximately every two years. The law is named after Intel co-founder Gordon E. Moore, who described the trend in his 1965
+
IBM is one of 30 companies in the Dow Jones Industrial Average.
  
−
Turing machine – a device that manipulates symbols on a strip of tape according to a table of rules
+
'''Infosys''' is headquartered in Bangalore. Infosys is the second-largest Indian IT company, after Tata Consultancy Services.
  
−
Universal Turing machine – a Turing machine that can simulate an arbitrary Turing machine on arbitrary input
+
'''Logitech''' was founded in Switzerland in 1981. Products include keyboards, mice, tablet accessories, headphones and headsets, webcams, and Bluetooth speakers. In 2008, Logitech announced that it had manufactured one billion computer mice since 1985.
  
−
ICQ is an instant messaging computer program
+
'''Oracle Corporation''' was founded in Redwood City, California and is now headquartered in Austin, Texas. Larry Ellison, a co-founder of Oracle, has served as Oracle's CEO since its founding in 1977. In 2020, Oracle was the third-largest software company in the world by revenue and market capitalization. The Oracle relational database management system (RDBMS) uses the Structured Query Language (SQL).
  
−
A QR code (abbreviated from Quick Response code) is a type of matrix barcode first designed for the automotive industry. More recently, the system has become popular outside of the industry due to its fast readability and comparatively large storage capacity. The code consists of black modules arranged in a square pattern on a white background
+
'''SAP''' is a German software company founded in 1972. It is the world's leading enterprise resource planning (ERP) software vendor and the largest non-American software company by revenue.
  
−
Shannon-Hartley theorem says that there is always ‘noise’ getting in the way of accurate transmission of information. The aim is to keep the noise to a minimum, maintaining a high signal-to-noise ratio. The total amount of data that can be transmitted over a given time period is called the bandwidth
+
'''Tata Consultancy Services (TCS)''' was founded in 1968 and is part of the Tata Group. TCS is the second largest Indian company by market capitalization.
  
−
Banburismus was a cryptanalytic process developed by Alan Turing at Bletchley Park during the Second World War. It was used by Bletchley Park's Hut 8 to help break German messages enciphered on Enigma machines
+
'''VMWare''' develops virtualization software, that creates an abstraction layer over computer hardware that allows the hardware elements of a single computer to be divided into multiple virtual computers, commonly called virtual machines (VMs).
  
−
The ban and the deciban were invented by Alan Turing with Jack Good in 1940, to measure the amount of information that could be deduced by the codebreakers at Bletchley Park using the Banburismus procedure
+
=== Networks and Mobile Phones ===
  
−
Reflected binary code, also known as Gray code after Frank Gray, is a binary numeral system where two successive values differ in only one bit. Gray codes are widely used to facilitate error correction in digital communications such as digital terrestrial television and some cable TV systems
+
==== Cellular Networks ====
 +
A Cellular network or Mobile network is a radio network distributed over land areas called cells, each served by at least one fixed-location transceiver, known as a cell site or base station. In a cellular network, each cell uses a different set of frequencies from neighboring cells, to avoid interference and provide guaranteed bandwidth within each cell.
  
−
LAMP – an acronym for an archetypal model of web service solution stacks, originally consisting of largely interchangeable components: Linux, the Apache HTTP Server, the MySQL relational database management system, and the PHP programming language
+
There are five generations of cellular networking technology –  
  
−
PHP is a server-side scripting language designed for web development. Created by Rasmus Lerdorf in 1994. While PHP originally stood for Personal Home Page, it now stands for PHP: Hypertext Preprocessor
+
1G - the first commercial cellular network was launched in Japan by Nippon Telegraph and Telephone in 1979. 1G was introduced to the USA in 1983.
  
 +
2G - launched on the Global System for Mobile Communications (GSM) in Finland in 1991. It provided significant mobile talk advancements, introducing encrypted calls. While radio signals on 1G networks are analog, radio signals on 2G networks are digital. The first SMS text message was sent from a computer to a mobile phone in 1992 in the UK, while the first person-to-person SMS from phone to phone was sent in Finland in 1993.
  
−
World Wide Web
+
3G - launched in 2001, 3G offered better voice quality and faster data transfer, allowing users to surf the internet and stream music on a mobile phone. Universal Mobile Telecommunications System (UMTS) is a third-generation mobile cellular system for networks based on the GSM standard.
  
−
ARPANET (Advanced Research Projects Agency Network), created by the Defense Advanced Research Projects Agency (DARPA) of the United States Department of Defense, was the world's first operational packet switching network, and the predecessor of the contemporary global Internet. The packet switching of the ARPANET was based on designs by Lawrence Roberts, of the Lincoln Laboratory
+
4G - the first 4G networks were commercially deployed in Norway and Sweden in 2009, and have since been deployed throughout most parts of the world. Starting at a minimum of 12.5 Mbps, 4G provided high-quality video streaming/chat, fast mobile web access, HD videos, and online gaming. 4G has speeds of up to 150 Mbit/s download.
  
−
The first Web site built (info.cern.ch) was at CERN, and was first put on line on 6 August 1991
+
5G - cellular phone companies began deploying worldwide in 2019. 5G has higher bandwidth to deliver faster speeds than 4G and can thus connect more different devices. 5G is capable of delivering significantly faster data rates than 4G, with peak data rates of up to 20 gigabits per second (Gbps).
  
−
Information superhighway – often associated with the former Vice President of the United States, Al Gore, though the exact origins of the term are unknown
+
==== Wi-Fi Networks ====
 +
Wi-Fi stands for Wireless Fidelity. It is used to create a wireless network of devices to access the internet. It follows IEEE 802.11 standards. Wi-Fi networks use multiple bands of radio waves and microwaves to transmit data among the devices wirelessly. In WiFi networks, Internet service is accessible only where a WiFi connection is present.
  
−
A country code top-level domain (ccTLD) is an Internet top-level domain generally used or reserved for a country
+
The current generation wireless standard is Wi-Fi 6.
  
−
Video blogging, sometimes shortened to vlogging, is a form of blogging for which the medium is video and is a form of Web television
+
==== Mobile phones ====
 +
<u>History</u>
  
−
Cleverbot is a web application that uses an artificial intelligence algorithm to hold conversations with humans. Cleverbot took part alongside humans in a formal Turing Test in 2011
+
The first hand-held cell phone was demonstrated by John F. Mitchell and Dr. Martin Cooper of Motorola in 1973, using a handset weighing around 2kg. In 1983, the DynaTAC 8000x was the first to be commercially available. From 1983 to 2014, worldwide mobile phone subscriptions grew from zero to over 7 billion.
  
−
Among the earliest online comics were ‘Witches and Stitches’, which was published on CompuServe in 1985, and ‘T.H.E. Fox’, which was published on CompuServe and Quantum Link in 1986
+
It was claimed that Ernie Wise made the first mobile phone call in the UK on 1 January 1985 from St Katharine Docks, East London, to Vodafone's Headquarters in Newbury.
  
−
Control Alt Delete, QC (Questionable Content) – web comics
+
The first SIM (Subscriber Identity Module) card was made in 1991 by Munich smart card maker Giesecke & Devrient.
  
−
The Whole Earth 'Lectronic Link, normally shortened to The WELL, is one of the oldest virtual communities in continuous operation. The WELL was started by Stewart Brand and Larry Brilliant in 1985
+
The first Short Message Service (SMS) text message was sent from a computer to a mobile phone in 1992 in the UK while the first person-to-person SMS from phone to phone was sent in Finland in 1993.
  
−
Ananova – first virtual newscaster
+
Symbian was an operating system used in Nokia phones. It was the most popular smartphone operating system on a worldwide average until the end of 2010, when it was overtaken by Android.
  
−
Cyberspace – virtual reality, the Internet, the World Wide Web, and other kinds of computer systems. Science-fiction author William Gibson coined the term in his novel ''Neuromancer''
+
Android is developed by a consortium of developers known as the Open Handset Alliance, though its most widely used version is primarily developed by Google. It was unveiled in 2007, with the first commercial Android device, the HTC Dream, being launched in 2008.
  
−
WikiLeaks is an international non-profit organisation that publishes submissions of private, secret, and classified media from anonymous news sources and news leaks. Its website, launched in 2006 under The Sunshine Press organisation, claimed a database of more than 1.2 million documents within a year of its launch
+
<u>Manufacturers</u>
  
−
GhostNet – a large-scale cyber spying operation discovered in 2009. Its command and control infrastructure is based mainly in the People's Republic of China
+
'''Apple'''
  
−
The Million Dollar Homepage is a website conceived in 2005 by Alex Tew, a student from Wiltshire, to raise money for his university education. The home page consists of a million pixels arranged in a 1000 × 1000 pixel grid; the image-based links on it were sold for $1 per pixel
+
The first-generation iPhone was released in June 2007. It incorporated a 3.5-inch multi-touch display and had a starting price of US$499.
  
−
Mashable is an American news website and Internet news blog founded by Pete Cashmore
+
The iPhone 3G was released in 2008 and introduced faster 3G connectivity, and a lower starting price of US$199.
  
−
Jezebel is a blog aimed at women's interests, under the tagline ‘Celebrity, Sex, Fashion. Without Airbrushing’. It is one of several blogs owned by Gawker Media
+
The iPhone 4 was marketed as the "world's thinnest smartphone" and introduced the Retina display.
  
−
xkcd is a webcomic created by Randall Munroe, a former contractor for NASA. Munroe describes it as ‘a webcomic of romance, sarcasm, math, and language’
+
The iPhone 4s was announced in 2011 and introduced the Siri virtual assistant.
  
−
Chatroulette is a online chat website that pairs strangers from around the world together for webcam-based conversations
+
The iPhone 5s introduced the Touch ID fingerprint authentication sensor.
  
−
The Spamhaus Project is an international organization founded in 1998 by Steve Linford to track email spammers and spam-related activity
+
The iPhone 14 and iPhone 14 Plus are the sixteenth and latest generation of iPhones, and were announced during Apple Event, Apple Park in Cupertino, California, in September 2022. The price of the iPhone 14 starts at $799.
  
−
BuzzFeed is a website that combines a technology platform for detecting viral content with an editorial selection process to provide a snapshot of ‘the viral web in realtime’
+
The iPhone runs on the iOS operating system. Major versions of iOS are released annually. The current stable version, iOS 16, was released in September 2022.
  
−
SETI@home is an Internet-based public volunteer computing project started in 1999. SETI@home searches for possible evidence of radio transmissions from extraterrestrial intelligence using observational data from the Arecibo radio telescope
+
The iPhone accounts for around 16% of global smartphone market share.
  
−
Folding@home is a distributed computing project for disease research that simulates protein folding, computational drug design, and other types of molecular dynamics
+
'''Blackberry'''
  
−
Ethernet was developed at Xerox PARC between 1973 and 1974. It was inspired by ALOHAnet, which Robert Metcalfe had studied as part of his PhD dissertation
+
The line of BlackBerry smartphones was developed and maintained by the Canadian company BlackBerry Limited (formerly known as Research In Motion, or RIM) from 1999 to 2016, after which it was licensed to various companies. The company was founded by Mike Lazaridis.
  
−
Dread Pirate Roberts is the founder and administrator of the illicit online marketplace the Silk Road, part of the internet’s dark net. The identity of Dread Pirate Roberts is kept hidden and the title may pass from one person to another, just as with the position's namesake in ''The Princess Bride'' novel by William Goldman
+
The phones were known for having a physical QWERTY keyboard.
  
−
Tor (previously an acronym for The Onion Router) is free software for enabling online anonymity and censorship resistance. Tor directs Internet traffic through a free, worldwide, volunteer network consisting of more than five thousand relays to conceal a user's location or usage from anyone conducting network surveillance or traffic analysis
+
At its peak in 2011, there were 85 million BlackBerry subscribers worldwide, but the rise of Google's Android platform and Apple's iOS caused it to decline in popularity by nearly three-quarters.
  
−
The Huffington Post is an American news website and aggregated blog founded by Arianna Huffington, Kenneth Lerer, and Jonah Peretti. Launched in 2005
+
BlackBerry phones are now officially defunct and are unable to function.
  
−
Rotten Tomatoes was launched in 1999, as a spare time project by Senh Dong. The company is currently owned by Flixster, itself owned by Warner Bros since May 2011
+
'''Google'''
  
−
Snopes is a web site that is the most widely-known resource for validating or debunking urban legends and Internet rumours
+
The Nexus line of Android phones started out in 2010 and reached its end in 2016, replaced by Google Pixel.
  
−
Tinder connects with users' Facebook profiles to provide pictures and ages for other users to view. Using GPS technology, users can set a specific radius. If two users like each other then it results in a match (double opt-in) and Tinder introduces the two users and opens a chat
+
The current models in the Pixel line are the Pixel 7 and Pixel 7 Pro.
  
−
Linden Lab – named after the street in San Francisco where the first office was situated
+
'''Huawei'''
  
−
Anshe Chung (avatar of Ailin Graef) – Linden Lab millionaire, a virtual real estate broker. Founded by Philip Rosedale
+
Huawei was founded in 1987 by Ren Zhengfei and is headquartered in Shenzhen.
  
−
Ask Jeeves – founded in 1996 by Garrett Gruener and David Warehen. Ask.com dropped Jeeves in February 2006
+
Their portfolio of phones includes both high-end smartphones, its Huawei Mate series and Huawei P series, and cheaper handsets that fall under its Honor brand.
  
−
Mumsnet is a community website set up by mothers to give advice on parenting and family issues. It was set up in 2000 by Justine Roberts and Carrie Longton
+
Huawei is currently banned from doing business with US companies as the US government considers Huawei to be a national security threat.
  
−
Airbnb is a website for people to rent out lodging. Founded in 2008 in San Francisco by Brian Chesky and Joe Gebbia
+
'''Motorola'''
  
−
Weibo – Chinese version of Twitter
+
Motorola MicroTAC is a cellular phone first manufactured as an analog version in 1989. The MicroTAC introduced a new "flip" design, where the "mouthpiece" folded over the keypad. This set the standard and became the model for modern flip phones today. Its predecessor was the much larger Motorola DynaTAC and it was succeeded by the Motorola StarTAC in 1996.
  
−
Phorm is a US company that offers a behavioral targeting advertisement service to monitor browsing habits and serve relevant advertisements to the end user
+
'''Nokia'''
  
−
TMZ is a celebrity news website. The name TMZ stands for ‘thirty-mile zone’, the historic ‘studio zone’ within a 30-mile radius centered on Los Angeles
+
Nokia made significant contributions to the mobile telephony industry, assisting in the development of the GSM, 3G, and LTE standards. For a decade beginning in 1998, Nokia was the largest worldwide vendor of mobile phones and smartphones. In the later 2000s, however, Nokia suffered from a series of poor management decisions, and soon saw its share of the mobile phone market drop sharply.
  
−
Favicon – (short for Favourite icon) is a file containing one or more small icons associated with a particular Web site or Web page
+
Nokia 5110 is a GSM mobile phone that was introduced in 1998.
  
−
CYCLADES packet switching network was a French research network created in the early 1970s. It was developed to explore alternatives to the ARPANET design and to support network research generally
+
Nokia 3210 is a GSM cellular phone, announced by Nokia in 1999.
  
−
Vinton Gray ‘Vint’ Cerf  is an American Internet pioneer, who is recognized as one of ‘the fathers of the Internet’, sharing this title with Bob Kahn, for the invention of TCP/IP
+
Nokia introduced its “Connecting People” advertising slogan in 1992.
  
−
Snapchat is a photo messaging application developed by Evan Spiegel, Bobby Murphy, and Reggie Brown, then Stanford University students. Using the application, users can take photos, record videos, add text and drawings, and send them to a controlled list of recipients. These sent photographs and videos are known as "Snaps". Users set a time limit for how long recipients can view their Snaps
+
'''Oppo'''
  
−
Shazam is a commercial mobile phone based music identification service. Shazam uses a mobile phone's built-in microphone to gather a brief sample of music being played. An acoustic fingerprint is created based on the sample, and is compared against a central database for a match
+
Oppo phones are smartphones produced by the partially state-owned Chinese company Oppo.
  
 +
The current lineup of phones includes the Find X, N, and Reno series.
  
−
Electronics
+
'''Samsung'''
  
−
Analog electronics – electronic systems with a continuously variable signal
+
The Samsung Galaxy was released in 2009. It uses the Android operating system.
  
−
Capacitor (formerly known as condenser) is a passive electronic component consisting of a pair of conductors separated by a dielectric (insulator). When a potential difference (voltage) exists across the conductors, an electric field is present in the dielectric. This field stores energy and produces a mechanical force between the conductors
+
The Galaxy S was released in 2010. It is produced in over two dozen variations, and 25 million units were sold by 2013.
  
−
A charge-coupled device (CCD) is a device for the movement of electrical charge, usually from within the device to an area where the charge can be manipulated, for example conversion into a digital value. The CCD is a major technology for digital imaging. Allows satellites to store images and send them back to Earth as radio waves
+
Samsung later expanded the Galaxy S line to tablet computers with the announcement of the Galaxy Tab S in 2014.
  
−
A cat’s whisker detector (sometimes called a crystal detector) is an antique electronic component consisting of a thin wire that lightly touches a crystal of semiconducting mineral to make a crude point-contact rectifier. This device was used as the detector in early crystal radios
+
In 2012, Samsung Electronics became the world's largest mobile phone maker by unit sales, overtaking Nokia. The Galaxy accounts for around 19% of global smartphone market share today.
  
−
Components connected in series are connected along a single path, so the same current flows through all of the components. Components connected in parallel are connected so the same voltage is applied to each component
+
In 2017, Samsung announced the voice-powered digital assistant named "Bixby". It was introduced alongside the Samsung Galaxy S8.
  
−
A flip-flop or latch is a circuit that has two stable states and can be used to store state information
+
Samsung announced the Samsung Galaxy S23 series, consisting of the Samsung Galaxy S23, Samsung Galaxy S23+ and Samsung Galaxy S23 Ultra, in February 2023.
  
−
Digital electronics represent signals by discrete bands of analog levels, rather than by a continuous range
+
'''Sony'''
  
−
Diode – device that allows current to flow in one direction only. Diode is the simplest vacuum tube
+
The Sony Xperia X1 was the first smartphone to be released by Sony, in 2008.
  
−
Integrated circuit – a set of electronic circuits on one small plate (‘chip’) of semiconductor material, normally silicon
+
Sony Mobile was previously known globally as Sony Ericsson before being rebranded in 2012.
  
−
Inverter – a device that converts DC to AC
+
The X10 was released in 2010. It was the first in the Xperia line to feature the Android operating system, where previous models ran on the Windows Mobile OS.
  
−
Light-emitting diode (LED) – a semiconductor diode that converts applied voltage to light
+
In 2017, Sony Mobile held less than 1% global market share.
  
−
Logic gate – a device implementing a Boolean function; that is, it performs a logical operation on one or more logical inputs, and produces a single logical output
+
'''Xiaomi'''
  
−
Types of logic gate – AND, OR, NOT, NAND, NOR, XOR (output is 1 if inputs are different), XNOR (inverse of XOR)
+
Xiaomi released its first smartphone in 2011. Most of the phones run on the MIUI User interface, which is based on the Android operating system.
  
−
Most Boolean logic gates can be created from a suitable network of NAND gates
+
Xiaomi's flagship mobile handset line is the Xiaomi series (formerly known as Mi series).
  
−
Photodiode – a semiconductor capable of converting light into either current or voltage
+
<u>List of Android versions</u>
 +
{| class="wikitable"
 +
|Version
 +
|Internal codename
 +
|Release date
 +
|-
 +
|Android 1.0
 +
|
 +
|2008
 +
|-
 +
|Android Cupcake
 +
|Cupcake
 +
|2009
 +
|-
 +
|Android Donut
 +
|Donut
 +
|2009
 +
|-
 +
|Android Eclair
 +
|Eclair
 +
|2009
 +
|-
 +
|Android Froyo
 +
|Froyo
 +
|2010
 +
|-
 +
|Android Gingerbread
 +
|Gingerbread
 +
|2010
 +
|-
 +
|Android Honeycomb
 +
|Honeycomb
 +
|2011
 +
|-
 +
|Android Ice Cream Sandwich
 +
|Ice Cream Sandwich
 +
|2011
 +
|-
 +
|Android Jelly Bean
 +
|Jelly Bean
 +
|2012
 +
|-
 +
|Android KitKat
 +
|Key Lime Pie
 +
|2013
 +
|-
 +
|Android Lollipop
 +
|Lemon Meringue Pie
 +
|2014
 +
|-
 +
|Android Marshmallow
 +
|Macadamia Nut Cookie
 +
|2015
 +
|-
 +
|Android Nougat
 +
|New York Cheesecake
 +
|2016
 +
|-
 +
|Android Oreo
 +
|Oatmeal Cookie
 +
|2017
 +
|-
 +
|Android Pie
 +
|Pistachio Ice Cream
 +
|2018
 +
|-
 +
|Android 10
 +
|Quince Tart
 +
|2019
 +
|-
 +
|Android 11
 +
|Red Velvet Cake
 +
|2020
 +
|-
 +
|Android 12
 +
|Show Cone
 +
|2021
 +
|-
 +
|Android 13
 +
|Tiramisu
 +
|2022
 +
|-
 +
|Android 14
 +
|Upside Down Cake
 +
|Q3 2023
 +
|-
 +
|Android 15
 +
|Vanilla Ice Cream
 +
|2024
 +
|}
  
−
Resistor – an electronic component that restricts the flow of current in an electrical or electronic circuit
+
==== Mobile Network Operators ====
 +
'''O2''' was formed in 1985 as Cellnet and was later rebranded as BT Cellnet. O2 was bought by Telefonica in 2005 for £18 billion, but retained its name and continued to be based in the United Kingdom.
  
−
Resistors in series – add values to get overall resistance R = R<sub>1</sub> + R<sub>2</sub> + R<sub>3</sub>...
+
'''Orange S. A'''. was created when Hutchison Whampoa acquired a controlling stake in Microtel Communications Ltd during the early-1990s and rebranded it Orange. It became a subsidiary of Mannesmann in 1999 and was acquired by France Telecom in 2000. The France Telecom company was rebranded to Orange in 2013.
  
−
Resistors in parallel – 1/R = 1/R<sub>1</sub> + 1/R<sub>2</sub> + 1/R<sub>3</sub>...
+
'''T-Mobile''' was launched as Mercury One2One (stylised one2one) in 1993. one2one was purchased by Deutsche Telekom in 1999. In 2010, it merged with Orange UK to form a joint venture, Everything Everywhere, which continued to operate the T-Mobile and Orange brands until 2015.
  
−
Rheostat – a continuously variable electrical resistor used to regulate current
+
'''Virgin Mobile''' is owned by Virgin Media which is part of Virgin Media O2. was launched in 1999 as a private joint venture between One2One (later T-Mobile UK) and the Virgin Group. Virgin Media O2 is the biggest mobile network in the UK with around 24 million mobile customers.
  
−
Semiconductor – a substance as germanium or silicon whose electrical conductivity is intermediate between that of a conductor and an insulator
+
'''Three UK''' (officially Hutchison 3G UK Limited) launched as the UK's first commercial video mobile network on 3 March 2003 (03-03-03), the day that 3G services went live across the country. In June 2023 it was announced that Three UK and Vodafone were planning to merge their UK-based operations.
  
−
n-type semiconductor – a semiconductor in which electrical conduction is due chiefly to the movement of electrons
+
'''EE''' is a brand within the BT Group. EE is the largest mobile network operator in the United Kingdom, with 32 million customers as of June 2023. The company was formed as Everything Everywhere in 2010 as a joint venture between Deutsche Telekom and France Telecom (now Orange S.A.). In 2012 it was rebranded to EE concurrently while launching the UK's first 4G mobile network.
  
−
p-type semiconductor – a semiconductor in which electrical conduction is due chiefly to the movement of positive holes
+
'''Vodafone''' was originally part of Racal Electronics. The company was formed in 1985 and is headquartered in Newbury, Berkshire. The company owns and operates networks in 21 countries, with partner networks in 48 further countries.
  
−
In semiconductor production, doping is the process of intentionally introducing impurities into an extremely pure (also referred to as intrinsic) semiconductor to change its electrical properties. The impurities are dependent upon the type of semiconductor. Lightly and moderately doped semiconductors are referred to as extrinsic. A semiconductor doped to such high levels that it acts more like a conductor than a semiconductor is referred to as degenerate
+
<u>Largest terrestrial mobile phone network operators</u>
 +
{| class="wikitable"
 +
|Company
 +
|Country
 +
|Subscriptions (in millions)
 +
|-
 +
|China  Mobile
 +
|China
 +
|974
 +
|-
 +
|Bharti  Airtel
 +
|India
 +
|496
 +
|-
 +
|Jio
 +
|India
 +
|436
 +
|-
 +
|China  Telecom
 +
|China
 +
|390
 +
|-
 +
|China  Unicom
 +
|China
 +
|320
 +
|-
 +
|America  Movil
 +
|Mexico
 +
|307
 +
|-
 +
|MTN Group
 +
|South  Africa
 +
|289
 +
|-
 +
|Telefonica
 +
|Spain
 +
|277
 +
|-
 +
|Vodafone
 +
|United  Kingdom
 +
|274
 +
|-
 +
|Orange
 +
|France
 +
|241
 +
|}
  
−
Thermistor – an electrical resistor whose resistance is greatly reduced by heating
+
== Older Technology ==
  
−
Transistor – a semiconductor device used to amplify and switch electronic signals
+
==== iPod ====
 +
iPod is a line of portable media players. The first version was released in 2001 and the product line was discontinued in 2022. Sales of iPods peaked in 2008. Apple sold an estimated 450 million iPod products
  
−
Bipolar and Field Effect – major types of transistor
+
iPod product lines –  
  
−
Thyristor – a four-layered semiconductor rectifier in which the flow of current between two electrodes is triggered by a signal at a third electrode. Used in dimmer switches
+
iPod (classic) – the original full-sized iPod line, marketed from 2001 to 2014, and retroactively named "classic" in 2007
  
−
Thyristor – a solid-state semiconductor device with four layers of alternating N and P-type materials
+
iPod mini – a smaller version, marketed from 2004 to 2005
  
−
Triode – an electronic amplifying vacuum tube (valve) which consists of three electrodes inside an evacuated glass envelope: a heated filament or cathode, a grid, and a plate (anode)
+
iPod nano – an even smaller version, marketed from 2005 to 2017
  
−
A vacuum tube, electron tube, or thermionic valve (reduced to simply ‘valve’), is a device that relies on the flow of electric current through a vacuum. Vacuum tubes rely on thermionic emission of electrons from a hot filament or hot cathode, that then travel through a vacuum toward the anode (commonly called the plate), which is held at a positive voltage relative to the cathode. Additional electrodes interposed between the cathode and anode can alter the current, giving the tube the ability to amplify and switch
+
iPod shuffle – a series of tiny screen-less versions, marketed from 2005 to 2017
  
 +
iPod touch – a series of iOS-based versions, marketed from 2007 to 2022
  
−
Mobile phones
+
==== Compact disc ====
 +
The compact disc was co-produced by Philips and Sony and released in 1982. By 2007, 200 billion CDs had been sold worldwide.
  
−
The first hand-held cell phone was demonstrated by John F. Mitchell and Dr. Martin Cooper of Motorola in 1973, using a handset weighing around 2 kg. In 1983, the DynaTAC 8000x was the first to be commercially available. From 1983 to 2014, worldwide mobile phone subscriptions grew from zero to over 7 billion
+
Standard CDs have a diameter of 120 mm (4.7 in) and are designed to hold up to 74 minutes of uncompressed stereo digital audio or about 650 MB of data.
  
−
It was claimed that Ernie Wise made the first mobile phone call in the UK on 1 January 1985 from St Katharine Docks, East London, to Vodafone's Headquarters in Newbury
+
CD formats –
  
−
The first SMS text message was sent from a computer to a mobile phone in 1992 in the UK, while the first person-to-person SMS from phone to phone was sent in Finland in 1993.
+
CD-ROM – Read-only memory
  
−
The first mobile news service, delivered via SMS, was launched in Finland in 2000
+
CD-R – Recordable. Can be written once and read arbitrarily many times.
  
−
The first SIM card was made in 1991 by Munich smart card maker Giesecke & Devrient
+
CD-RW – Rewritable. Can be written, read, erased, and re-written
  
−
GSM (Global System for Mobile Communications) is a standard developed by the European Telecommunications Standards Institute (ETSI) to describe protocols for second-generation (2G) digital cellular networks used by mobile phones. As of 2014<sup>[update]</sup> it has become the default global standard for mobile communications
+
The standard plastic case used by most manufacturers is known as a jewel case.
  
−
Universal Mobile Telecommunications System (UMTS) is a third generation mobile cellular system for networks based on the GSM standard
+
==== DVD ====
 +
The DVD (Digital Video Disc or Digital Versatile Disc) is an optical disc. It was invented in Japan and released in 1996.
  
−
Symbian – operating system used in Nokia phones. It was the most popular smartphone OS on a worldwide average until the end of 2010, when it was overtaken by Android
+
A standard DVD can store up to 4.7 GB of data.
  
−
Demand for metals found in mobile phones and other electronics fuelled the Second Congo War
+
Blank recordable DVD discs (DVD-R and DVD+R) can be recorded once using a DVD recorder and then function as a DVD-ROM. Rewritable DVDs (DVD-RW, DVD+RW, and DVD-RAM) can be recorded and erased many times.
  
−
In 2014, the top cell phone manufacturers were Samsung, Nokia, Apple, and LG
+
Since 2008, DVD sales have declined more than 86%, due to a rise in customers buying on-demand and digital copies of films and the launch of streaming services.
  
−
The world's largest individual mobile operator by subscribers is China Mobile with over 500 million mobile phone subscribers
+
The high-definition optical disc format war was between the Blu-ray Disc and Toshiba HD DVD optical disc standards for storing high-definition video and audio; it took place between 2006 and 2008 and was won by Blu-ray Disc.
  
 +
Blu-ray Disc refers to the blue laser used to read the disc, which allows information to be stored at a greater density than is possible with the longer-wavelength red laser used for DVDs.
  
−
Video recorders
+
A standard Blu-ray Disc can store up to 25 GB of data. High-definition (HD) video may be stored on Blu-ray Discs with up to 1920 × 1080 pixel resolution.
  
−
The videocassette recorder, VCR, or video recorder, records analog audio and analog video from broadcast television or other source on a removable, magnetic tape videocassette
+
==== Video recorder ====
 +
The videocassette recorder, VCR, or video recorder, records analog audio and analog video from broadcast television or other source on a removable, magnetic tape videocassette.
  
 
Ampex introduced the Quadruplex videotape professional broadcast standard format with its Ampex VRX-1000 in 1956. It became the world's first commercially successful videotape recorder
 
Ampex introduced the Quadruplex videotape professional broadcast standard format with its Ampex VRX-1000 in 1956. It became the world's first commercially successful videotape recorder
  
−
In 1959 Toshiba announced a new method of recording known as helical scan, first implemented in reel-to-reel videotape recorders (VTRs)
+
In 1959 Toshiba announced a new method of recording known as helical scan, first implemented in reel-to-reel videotape recorders (VTRs).
 +
 
 +
The Telcan, produced by the UK Nottingham Electronic Valve Company in 1963, was the first home video recorder.
 +
 
 +
The Sony model CV-2000, first marketed in 1965, was their first VTR intended for home use.
 +
 
 +
In the 1970s, JVC’s VHS (Video Home System) won the ‘Videotape format war’ against Sony’s Betamax and Philip’s V2000. While Betamax was believed to be the superior format in the minds of the public and press (due to excellent marketing by Sony), consumers wanted an affordable VCR (which often cost hundreds of dollars less than a Betamax player).
 +
 
 +
DVD rentals in the United States first exceeded those of VHS in 2003.
 +
 
 +
The last VHS recorders were manufactured in 2016.
 +
 
 +
==== Cassette tape ====
 +
The cassette tape was invented by Lou Ottens at Philips in 1963. Compact Cassettes come in two forms, either containing content as a prerecorded cassette (Musicassette), or as a fully recordable "blank" cassette.
 +
 
 +
Tape length usually is measured in minutes of total playing time. The most popular varieties of blank tape were C60 (30 minutes per side), C90 (45 minutes per side) and C120 (60 minutes per side).
 +
 
 +
Sales of CDs overtook those of prerecorded cassettes in the early 1990s. Sales of pre-recorded music cassettes in the US dropped from 442 million in 1990 to 274,000 by 2007.
 +
 
 +
Cassette tapes have seen a modest resurgence, and in the UK, sales of cassette tapes in 2021 reached its highest number since 2003.
 +
 
 +
==== Personal stereo ====
 +
A personal stereo is also known as a personal cassette player.
 +
 
 +
The Sony Walkman was released in 1979. It became a popular and widely imitated consumer item in the 1980s. 220 million cassette-type Walkman were sold by the end of production in 2010.
 +
 
 +
==== Portable CD player ====
 +
Discman was Sony's brand name for portable CD players. The first Discman, the D-50/D-5, was launched in 1984, two years after mass production of CDs began. The brand name was later changed to CD Walkman. Production ceased in 2008.
 +
 
 +
== Electronics ==
 +
 
 +
==== History ====
 +
Vacuum tubes (thermionic valves) were the first active electronic components which controlled current flow by influencing the flow of individual electrons.
 +
 
 +
The simplest vacuum tube, the diode, was invented in 1904 by John Ambrose Fleming. Electrons can flow in only one direction through the device – from the cathode to the anode.
  
−
The Telcan, produced by the UK Nottingham Electronic Valve Company in 1963, was the first home video recorder
+
The triode, which consists of three electrodes inside an evacuated glass envelope: a heated filament or cathode, a grid, and a plate (anode), was the first practical electronic amplifier. Invented in 1906 by Lee De Forest.
  
−
The Sony model CV-2000, first marketed in 1965, was their first VTR intended for home use
+
William Shockley of Bell Labs invented the first transistor in 1947.
  
−
In the 1970s, JVC’s VHS (Video Home System) won the ‘Videotape format war’ against Sony’s Betamax and Philip’s V2000
+
The MOSFET (metal-oxide-semiconductor field-effect transistor) was invented at Bell Labs in 1959. The MOSFET was the first truly compact transistor that could be miniaturised and mass-produced for a wide range of uses.
  
−
DVD rentals in the United States first exceeded those of VHS in 2003
+
Jack Kilby and Robert Noyce created the first integrated circuit in 1958.
  
−
The High definition optical disc format war was between the Blu-ray Disc and HD DVD optical disc standards for storing high definition video and audio; it took place between 2006 and 2008 and was won by Blu-ray Disc
+
Very large-scale integration (VLSI) is the process of creating an integrated circuit (IC) by combining millions or billions of MOS transistors onto a single chip. VLSI began in the late 1970s.
  
 +
==== Electronic components ====
 +
[[File:Circuit Symbols for A-level-OCR-Physics A.png|center|thumb|900x900px]]
  
−
Companies
+
Components can be classified as active or passive. Active components can control the flow of current, amplify power, and require an external source of energy. Passive components cannot control the current, have no power gain, and do not need an external source of energy.
  
−
'''Acorn Computers''' was founded in 1978 by Hermann Hauser and Chris Curry. Produced the Acorn Electron and BBC Micro (1981)
+
<u>Active components</u>
  
−
'''Adobe Systems''' – Photoshop was created by Thomas Knoll and John Knoll
+
Transistor – a semiconductor device used to amplify and switch electronic signals. The two types of transistors are the bipolar junction transistor (BJT) and the field-effect transistor (FET).
  
−
'''Alibaba''' Group was founded in 1999 by Jack Ma with the web site Alibaba.com
+
Thyristor – a four-layered semiconductor rectifier in which the flow of current between two electrodes is triggered by a signal at a third electrode.
  
−
'''Amazon''' was incorporated in 1994, in the state of Washington. In 1995, the company began service and sold its first book on amazon.com – Douglas Hofstadter’s ''Fluid Concepts and Creative Analogies: Computer Models of the Fundamental Mechanisms of Thought''
+
Diode – a vacuum tube that allows current to flow in one direction only.
  
−
Amazon was founded by CEO Jeff Bezos in 1994
+
Light-emitting diode (LED) – a semiconductor diode that converts applied voltage to light.
  
−
Amazon Kindle is an electronic book (e-book) device launched in the United States by Amazon.com in 2007. It uses an electronic paper display, reads the proprietary Kindle (AZW) format, and downloads content over Amazon Whispernet, which uses the Sprint EVDO network
+
Photodiode – a semiconductor capable of converting light into either current or voltage.
  
−
'''Apple''' was founded by Steve Jobs, Steve Wozniak, and Ronald Wayne on 1 April 1976, to develop and sell personal computers. It was incorporated as Apple Computer, Inc. in 1977, and was renamed as Apple Inc. in 2007, to reflect its shifted focus towards consumer electronics
+
Triode – an electronic amplifying vacuum tube.
  
−
The Apple I went on sale in July 1976 and was market-priced at $666.66
+
<u>Passive components</u>
 +
 
 +
Resistor – an electronic component that restricts the flow of current in an electrical or electronic circuit.
 +
 
 +
Rheostat – a variable resistor that controls the flow of electric current by changing the resistance.
 +
 
 +
Potentiometer – a three-terminal resistor with a sliding or rotating contact that forms an adjustable voltage divider.
 +
 
 +
Thermistor – an electrical resistor whose resistance is greatly reduced by heating.
 +
 
 +
Memristor – an electrical component that limits or regulates the flow of electrical current in a circuit and remembers the amount of charge that has previously flowed through it.
 +
 
 +
Capacitor – formerly known as a condenser, is a device that stores electrical energy in an electric field by accumulating electric charges on two closely spaced surfaces that are insulated from each other.
 +
 
 +
Inductor – an electrical component that stores energy in a magnetic field when electric current flows through it.
  
−
VisiCalc created a business market for the Apple II
+
A flip-flop or latch is a circuit that has two stable states and can be used to store state information.
  
−
Apple Lisa was released in 1983
+
==== Semiconductors ====
 +
A semiconductor is a substance such as silicon or germanium whose electrical conductivity is intermediate between that of a conductor and an insulator. Its resistivity falls as its temperature rises
  
−
Apple Mac was introduced by Steve Jobs in 1984. Its debut was signified by ''1984'', a $1.5 million television commercial modeled after the George Orwell novel and directed by Ridley Scott, that aired during the 1984 Super Bowl
+
In semiconductor production, doping is the process of intentionally introducing impurities into an extremely pure (also referred to as intrinsic) semiconductor to change its electrical properties. The impurities are dependent upon the type of semiconductor. Lightly and moderately doped semiconductors are referred to as extrinsic. A semiconductor doped to such high levels that it acts more like a conductor than a semiconductor is referred to as degenerate.
  
−
iMac was the first PC sold without a floppy drive
+
n-type semiconductor – a semiconductor in which electrical conduction is due chiefly to the movement of electrons.
  
−
iMac is a range of all-in-one Macintosh desktop computers built by Apple. It has been the primary part of Apple's consumer desktop offerings since its introduction in 1998, and has evolved through five distinct forms
+
p-type semiconductor – a semiconductor in which electrical conduction is due chiefly to the movement of positive holes.
  
−
Newton platform was an early personal digital assistant and the first tablet platform developed by Apple, the second platform being iOS, used in the iPhone, iPod Touch and iPad. Development of the Newton platform started in 1987 and ended in 1998
+
Semiconductor device fabrication is the process used to manufacture semiconductor devices, typically integrated circuits. Electronic circuits are gradually created on a wafer, typically made of pure single-crystal semiconducting material. Silicon is almost always used.
  
−
iMac and iPod designed by Jonathan Ive
+
==== Integrated Circuits ====
 +
An integrated circuit (chip, or microchip) is a set of electronic circuits on one small plate (‘chip’) of semiconductor material, normally silicon. Large numbers of miniaturized transistors and other electronic components are integrated together on the chip.
  
−
Ipod nano (2005), shuffle (2005), touch (2007), classic (2007)
+
<u>Generations of integrated circuits</u>
 +
{| class="wikitable"
 +
|Name
 +
|Year
 +
|Transistor count
 +
|Number of logic  gates
 +
|-
 +
|Small-scale integration (SSI)
 +
|1964
 +
|1 to 10
 +
|1 to 12
 +
|-
 +
|Medium-scale integration (MSI)
 +
|1968
 +
|10 to 500
 +
|13 to 99
 +
|-
 +
|Large-scale integration (LSI)
 +
|1971
 +
|500 to 20,000
 +
|100 to 9,999
 +
|-
 +
|Very large-scale integration (VLSI)
 +
|1980
 +
|20,000 to 1,000,000
 +
|10,000 to 99,999
 +
|}
 +
VLSI was made practical by technological advancements in semiconductor device fabrication.
  
−
iPhone 4S has a voice recognizing and talking assistant called Siri
+
Ultra large-scale integration (ULSI) was proposed for chips of more than 1 million transistors.
  
−
John Sculley was president of PepsiCo (1977–83), until he became CEO of Apple in 1983, a position he held until leaving in 1993
+
Moore’s Law states that “the number of transistors that can be placed inexpensively on an integrated circuit doubles approximately every two years”. The law is named after Intel co-founder Gordon E. Moore, who described the trend in his 1965.
  
−
iCloud allows users to store data such as music files for download to multiple devices such as iPhones, iPods, iPads, and personal computers running Mac OS X or Microsoft Windows on computer servers owned by Apple
+
An application-specific integrated circuit (ASIC) is an integrated circuit chip customized for a particular use, rather than intended for general-purpose use.
  
−
Retina Display is a brand name used by Apple for liquid crystal displays which they claim have a high enough pixel density that the human eye is unable to notice pixelation at a typical viewing distance
+
A gate array is an approach to the design and manufacture ASICs using a prefabricated chip with components that are later interconnected into logic devices.
  
−
Tim Cook – CEO of Apple
+
<u>Manufacturers</u>
  
−
Apple's worldwide annual revenue in 2014 totaled US$182 billion
+
'''Foxconn''', based in Taiwan, is the world's largest maker of electronic components. Up to the iPhone 4, all iPhones and other Apple devices, such as iPod Touch models and iPads, were manufactured by Foxconn.
  
−
Safari is the default web browser for iPad
+
'''Taiwan Semiconductor Manufacturing Company (TSMC)''' is the world's most valuable semiconductor company. The company was founded in Taiwan in 1987 by Morris Chang. In 1997 it became the first Taiwanese company to be listed on the New York Stock Exchange.
  
−
'''ARM Holdings''' is market dominant in the field of mobile phone chips. Based in Cambridge. The company was founded as Advanced RISC Machines, ARM, a joint venture between Acorn Computers, Apple Computer and VLSI Technology
+
==== Logic Gates ====
 +
A logic gate is a device implementing a Boolean function; that is, it performs a logical operation on one or more logical inputs, and produces a single logical output. The primary way of building logic gates uses diodes or transistors acting as electronic switches. Today, most logic gates are made from MOSFETs.
  
−
'''ASOS.com''' is an online-only fashion and beauty store. Revenue in 2012 was £495 million
+
[[File:Summary-of-the-common-Boolean-logic-gates-with-symbols-and-truth-tables.png|center|thumb|595x595px]]
  
−
'''BlackBerry''' Limited, formerly known as Research In Motion Limited (RIM), is a Canadian telecommunication and wireless equipment company founded by Mike Lazaridis. BlackBerry Bold family was launched in 2008
+
The NOT gate is more commonly called an inverter. The circle on the symbol is called a bubble and is used in logic diagrams to indicate a logic negation.
  
−
'''Bebo''' – online social networking site. Founded in 2005 by Michael and Xochi Birch. In 2013, the company voluntarily filed for Chapter 11 bankruptcy protection
+
The output of the exclusive-OR (XOR) gate is true only when the two input values are different.
  
−
'''Boo.com''' was a British Internet company, founded by three Swedes, which went bust following the dot-com boom of the late 1990s. The company spent $135 million of venture capital in just 18 months, and it was placed into receivership in 2000 and liquidated
+
The XNOR is the logical complement of the XOR gate.
  
−
'''Bwin.Party Digital Entertainment''' is an online gambling company. The world's largest publicly traded online gambling firm, it is best known for its online poker room PartyPoker.com. Bwin sponsored Real Madrid, AC Milan and Bayern Munich and more recently Olympique de Marseille
+
All Boolean logic gates can be created from a suitable network of NAND gates or NOR gates.
  
−
'''Cisco Systems''' was founded in 1984 by Leonard Bosack, who was in charge of the Stanford University computer science department's computers, and Sandy Lerner. John Chambers has been chairman and CEO since 1995
+
Microprocessors may contain more than 100 million logic gates.
  
−
'''Compaq''' was founded by Rob Canion. Acquired by Hewlett-Packard in 2002
+
== Big Tech ==
 +
Big Tech, also known as the Tech Giants, refers to the most dominant companies in the information technology industry. The term when referring to American technology companies notably the five largest from the United States: Alphabet (Google), Amazon, Apple, Meta (Facebook), and Microsoft.
  
−
'''Craigslist''' is a centralized network of online communities, featuring free classified advertisements. The service was founded in 1995 by Craig Newmark for the San Francisco Bay Area
+
'''Alphabet (Google)'''
  
−
'''eBay''' was founded by Pierre Omidyar in 1996. Would have been called echobay.com, had the domain name not already been taken. One of the first items sold on AuctionWeb (earlier web sirte created by Omidyar) was a broken laser pointer for $14.83. John Donahoe is CEO of eBay
+
Google was founded in 1998 by Larry Page and Sergey Brin while they were Ph.D. students at Stanford University.
  
−
'''Facebook''' Mark Zuckerberg – CEO of Facebook, which he founded while attending Harvard
+
The Google HQ in Mountain View, California, is known as the Googleplex.
  
−
Sheryl Sandberg – Chief Operating Officer of Facebook
+
Eric Schmidt served as the CEO of Google from 2001 to 2011 and the company's executive chairman from 2011 to 2015.
  
−
In 2006, Facebook launched News Feed, a product to show what your friends were doing on the site
+
Sundar Pichai is the CEO of Alphabet and Google.
  
−
Yahoo! offered $1 billion for Facebook in 2006
+
In 2006, Google acquired YouTube for $1.65 billion in Google stock.
  
−
Microsoft offered $15 billion for Facebook in 2007
+
Waze provides satellite navigation software on smartphones and other computers that support the Global Positioning System (GPS). The company was acquired by Google in 2013.
  
−
Winkelvoss twins received $65 million in settlement from Facebook in 2008
+
In 2015, Google announced plans to reorganize its various interests as a conglomerate named Alphabet Inc. Google became Alphabet's largest subsidiary and the umbrella company for Alphabet's Internet interests.
  
−
Facebook Home is a user interface layer for Android-compatible smartphones
+
Google Ads (previously known as Google AdWords) is an online advertising platform developed by Google, where advertisers bid to display brief advertisements, service offerings, product listings, and videos to web users. Google Ads is the main source of revenue for Alphabet.
  
−
Facemash – predecessor to Facebook
+
Google Drive is a file storage and synchronization service created by Google. It allows users to store files in the cloud, share files, and edit documents, spreadsheets, and presentations with collaborators.
  
−
Sponsored Stories are posts from your friends or Pages on Facebook that a business, organization or individual has paid to highlight
+
Google Cloud Platform is a suite of cloud computing services.
  
−
'''Flickr''' is an image and video hosting website, web services suite, and online community. Flickr was developed by Ludicorp, a Vancouver-based company that launched Flickr in February 2004
+
Google Earth is a virtual globe program that was originally called Earth Viewer and was created by Keyhole, Inc. It maps the earth by the superimposition of images obtained from satellite imagery, aerial photography and GIS over a 3D globe.
  
−
'''Foxconn''', based in Taiwan, is the world's largest maker of electronic component including printed circuit boards
+
Google Maps is a web mapping platform and consumer application. It offers satellite imagery, aerial photography, street maps, 360° interactive panoramic views of streets (Street View), real-time traffic conditions, and route planning for traveling by foot, car, bike, and public transportation. As of 2020, Google Maps was being used by over one billion people every month around the world.
  
−
'''GoDaddy''' is the largest domain name registration company in the world
+
Waymo is Google’s self-driving car project. The company was founded in 2009.
  
−
'''Google''' was founded in 1998 by Larry Page and Sergey Brin while they were Ph.D. students at Stanford University
+
Google Glass was a brand of smart glasses. Google started selling a prototype of Google Glass in 2013, before it became available to the public in 2014.The headset received a great deal of criticism amid concerns that its use could violate existing privacy laws, and in 2015 Google announced that it would stop producing the Google Glass prototype.
  
−
HQ in Mountain View, California
+
Google TV was a smart TV operating system from Google co-developed by Intel, Sony and Logitech. It launched in 2010 and was succeeded in 2014 by Android TV.
  
−
Googlefight is a website that allows users to compare the number of search results returned by the Google search engine for two given queries
+
Daydream is a discontinued virtual reality (VR) platform which was developed by Google, primarily for use with a headset into which a smartphone is inserted. Google is discontinued Daydream in 2019, due to a lack of interest from both consumers and developers.
  
−
Android – a software stack for mobile devices that includes an operating system, middleware and key applications that uses a modified version of the Linux kernel
+
Ruth Kedar designed the Google logo.
  
−
Android is a mobile operating system initially developed by Android Inc. Android was bought by Google in 2005
+
'''Amazon'''
  
−
AdWords is Google's flagship advertising product and main source of revenue.AdWords offers pay-per-click (PPC) advertising, and site-targeted advertising for both text and banner ads
+
Amazon was founded by Jeff Bezos from his garage in Bellevue, Washington, in 1994.
  
−
Google was originally known as Backrub
+
The first book sold on amazon.com was Douglas Hofstadter’s ''Fluid Concepts and Creative Analogies: Computer Models of the Fundamental Mechanisms of Thought''
  
−
Google Earth is a virtual globe program that was originally called Earth Viewer and was created by Keyhole, Inc. It maps the earth by the superimposition of images obtained from satellite imagery, aerial photography and GIS over a 3D globe. It is available under three different licenses: Google Earth, a free version with limited functionality; Google Earth Plus, which includes a few more features; and Google Earth Professional, intended for commercial use
+
Amazon went public in 1997. It began selling music and videos in 1998.
  
−
Google Street View is a feature of Google Maps and Google Earth that provides for many streets in the world 360° horizontal and 290° vertical panoramic views
+
Amazon opened a physical Amazon Books store in University Village in Seattle in 2015.
  
−
<nowiki>*</nowiki>Google+ (pronounced and sometimes written as Google Plus, sometimes abbreviated as G+) is a social networking and identity service
+
Amazon Web Services (AWS) was launched in 2002.
  
−
Google Glass is a wearable computer with a head-mounted display (HMD) that is being developed by Google in the Project Glass research and development project
+
Andy Jassy replaced Jeff Bezos as CEO in 2021.
  
−
Changing Google logo is known as the Google Doodle
+
IMDB was purchased by Amazon in 1998.
  
−
Larry Page – CEO of Google
+
Audible is an American online audiobook and podcast service that allows users to purchase and stream audiobooks and other forms of spoken word content. It was purchased by Amazon in 2008.
  
−
Eric Schmidt – Executive chairman of Google
+
Goodreads was purchased by Amazon in 2013.
  
−
'''Groupon''' (a portmanteau derived from ‘group coupon’) is a deal-of-the-day website that features discounted gift certificates usable at local or national companies. Groupon was launched in 2008, the first market for Groupon was Chicago. The idea for Groupon was created by now-CEO Andrew Mason
+
Twitch was purchased by Amazon in 2014.
  
−
'''Hewlett-Packard''' bought Palm in 2010 for $1.2 billion. Meg Whitman – CEO of Hewlett-Packard
+
Amazon Prime is a paid subscription service that gives users access to additional services otherwise unavailable or available at a premium to other Amazon customers. Services include same, one- or two-day delivery of goods, and streaming music and video
  
−
'''IBM'''. The Computing Tabulating Recording Company became IBM in 1924
+
Amazon Music is a music streaming platform and online music store.
  
−
Virginia Rometty – CEO of IBM
+
Amazon Kindle is a series of e-readers designed and marketed by Amazon. Launched in 2007.
  
−
'''IMDb''' originated from a list started as a hobby by film enthusiast Col Needham (founder and CEO of IMDb) in 1989
+
Amazon Alexa is a virtual assistant, first used in the Amazon Echo smart speaker and the Echo Dot.
  
−
'''Intel''' – Integrated Electronics, founded in 1968. Purchased McAfee in 2011
+
Amazon Fresh is a grocery retailer with physical stores and delivery services in most major U.S. cities.
  
−
'''Instagram''' was created by Kevin Systrom and Mike Krieger and launched in 2010
+
'''Apple'''
  
−
'''Just Eat''' is an online takeaway food delivery service, headquartered in the UK and operating in 13 countries. Founded in 2000 in Denmark. Floated on the London Stock Exchange in 2014
+
Apple was founded by Steve Jobs, Steve Wozniak, and Ronald Wayne in 1976, to develop and sell personal computers. It was incorporated as Apple Computer, Inc. in 1977, and was renamed as Apple Inc. in 2007, to reflect its shifted focus towards consumer electronics.
  
−
'''Kaspersky Lab''' is a Russian computer security company, co-founded by Natalia Kaspersky and Eugene Kaspersky in 1997, offering anti-virus, anti-spyware, anti-spam, and anti-intrusion products
+
Ronald Wayne left after 12 days and relinquished his (10%) share of the partnership back to Jobs and Wozniak for $800.
  
−
'''King.com''' is a casual-social games company, and the largest game developer on Facebook. Games include ''Candy Crush Saga''
+
John Sculley was CEO of Apple from 1983 to 1993.
  
−
'''Lenovo''' is China’s largest PC manufacturer. Formerly the PC branch of IBM
+
Tim Cook has been CEO of Apple since 2011.
  
−
'''LinkedIn''' was founded by Reid Hoffman in 2002
+
Apple Park is the corporate headquarters of Apple, located in Cupertino, California. The main building's scale and circular design, by Norman Foster, have earned the structure the media nickname "the spaceship". Opened in 2017.
  
−
'''Microsoft''' was founded in 1975 in Albuquerque by Bill Gates and Paul Allen. HQ is now in Redmond, Washington
+
Jony Ive was the chief design officer of Apple from 1997 until 2019. He played a vital role in the designs of the iMac, iPod, iPhone, iPad, and MacBook.
  
−
Bing – Microsoft web search engine
+
The Apple I went on sale in July 1976 and was market-priced at $666.66
  
−
Kinect for Xbox 360 is a ‘controller-free gaming and entertainment experience’. Based around a webcam-style add-on peripheral for the Xbox 360 console, it enables users to control and interact with the Xbox 360 without the need to touch a game controller, through a natural user interface
+
Apple Lisa was released in 1983. It is one of the first personal computers to present a graphical user interface (GUI) in a machine aimed at individual business users. Only 10,000 were sold in two years and it was considered a commercial failure.
  
−
''Start Me Up'' – used to advertise Windows 95
+
Apple Mac was introduced by Steve Jobs in 1984. Its debut was signified by “1984”, a $1.5 million television commercial modeled after the George Orwell novel and directed by Ridley Scott, that aired during the 1984 Super Bowl.
  
−
Bing Map is a web mapping service provided as a part of Microsoft's Bing suite of search engines
+
NeXT was founded in 1985 by Steve Jobs after he was fired from Apple the same year. NeXT introduced the first NeXT Computer in 1988. Apple purchased NeXT in 1996.
  
−
Satya Nadella – CEO of Microsoft
+
iMac was a range of all-in-one Macintosh desktop computers built by Apple. It was sold from 1998 to 2003. iMac was the first PC sold without a floppy drive.
  
−
'''Mind Candy''' is a British entertainment company, formed in 2004 by UK internet entrepreneur Michael Acton Smith''. Moshi Monsters'' is a website developed by Mind Candy aimed at children aged 6–14 with over 87 million registered users worldwide. Users choose from one of six virtual pet monsters. Players navigate their way around Monstro City
+
Newton platform was an early personal digital assistant and the first tablet platform developed by Apple, the second platform being iOS, used in the iPhone, iPod Touch and iPad. Development of the Newton platform started in 1987 and ended in 1998.
  
−
'''MySpace''' was founded by Tom Anderson. Rupert Murdoch paid $580 million to buy MySpace in 2005
+
Apple introduced the iBook, a laptop aimed at the consumer and education markets, in 1999. Apple replaced the iBook line with the MacBook in 2006 during the Mac transition to Intel processors.
  
−
'''Napster''' was an online music file sharing service created by Shawn Fanning while he was attending Northeastern University in Boston. The service operated between June 1999 and July 2001. Opposed by Metallica
+
The first Apple Store retail locations were opened in the US in 2001.
  
−
'''Net-a-Porter''' is a high-fashion retailer that operates via a website designed in the style of a magazine
+
iTunes Store was introduced in 2003. The service offered music downloads for 99 cents a song and integration with the iPod. The iTunes Store quickly became the market leader in online music services, and by 2010 was the world's largest music retailer.
  
−
'''Netflix''' was founded in 1997 in Scotts Valley, California by Marc Randolph and Reed Hastings. Netflix has subscribers in over 40 countries
+
In 2008, Apple launched the App Store to sell third-party applications for the iPhone and iPod Touch.
  
−
'''NeXT''' was founded in 1985 by Steve Jobs after he was fired from Apple the same year. NeXT introduced the first NeXT Computer in 1988. Apple purchased NeXT in 1996
+
Beats Music was acquired by Apple as part of its purchase of Beats Electronics in May 2014. Beats Music stopped accepting new subscriptions when Apple Music launched in June 2015.
  
−
'''PayPal''' was co-founded by Elon Musk in 1998. Bought by eBay in 2002
+
Apple bought Shazam in 2018.
  
−
'''Photobucket''' is an image hosting, video hosting, slideshow creation and photo sharing website. It was founded in 2003 by Alex Welch and Darren Crystal
+
FaceTime works by using an Apple device’s mobile data or Wi-Fi connection to make voice and/or video calls to other Apple device users.
  
−
'''Reddit''' is a collection of entries submitted by its registered users, essentially a bulletin board system. Founded by Steve Huffman and Alexis Ohanian in 2005
+
Retina Display is a brand name used by Apple for liquid crystal displays which they claim have a high enough pixel density that the human eye is unable to notice pixelation at a typical viewing distance.
  
−
'''SanDisk''' Corporation, formerly SunDisk, is an American multinational corporation which designs and markets flash memory card products. SanDisk was founded in 1988 by Eli Harari and Sanjay Mehrotra
+
Apple Watch is a line of smartwatches that incorporates fitness tracking, health-oriented capabilities, and wireless telecommunication, and integrates with iOS and other Apple products and services. An estimated 100 million units had been sold by 2020
  
−
'''Sinclair''' Executive was Clive Sinclair's first venture into the pocket calculator market. Launched in 1972
+
AirPods are wireless Bluetooth earbuds first announced in 2016.
  
−
Sinclair Cambridge calculator was launched in 1973
+
The Apple logo was created by Rob Janoff.
  
−
Sinclair ZX Spectrum was released in 1982
+
"There's an app for that" which was first used in a commercial for the iPhone, is a slogan that has been officially trademarked by Apple.
  
−
Sinclair C5 was a small one-person battery electric vehicle, introduced in 1985 at a cost of £399. Out of 14,000 C5s made, only 5,000 were sold before its manufacturer, Sinclair Vehicles, went into receivership
+
'''Meta (Facebook)'''
  
−
'''Skype''' is a peer-to-peer Internet telephony network founded by the entrepreneurs Niklas Zennstrom and Janus Friis, also founders of the file sharing application KaZaA and free internet venture Joost
+
Facebook was founded in 2004 by Mark Zuckerberg and some fellow Harvard College students. Its predecessor was a website called Facemash, and it was originally known as Thefacebook. Initially this was only opened to people with a Harvard email address.
  
−
'''Sporcle''' was founded bt Matt Ramme in 2007
+
Zuckerberg had previously worked on a similar project with fellow students Cameron Winklevoss, Tyler Winklevoss, and Divya Narendra. He eventually quit to do Thefacebook, but his ex-collaborators say he stole their concept and ideas and they wanted recompense. They eventually came to a settlement in 2008, with each of the trio receiving 1.2m shares in Facebook.
  
−
'''Spotify''' was founded in 2006 by Daniel Ek and Martin Lorentzon. Spotify – a proprietary peer-to-peer music streaming service that allows instant listening to specific tracks or albums with almost no buffering delay
+
The company announced 500 million users in July 2010.
  
−
'''Telegram''' was founded in 2013 by the brothers Nikolai and Pavel Durov, the founders of VK, Russia's largest social network
+
Facebook acquired Instagram in 2012 for approximately US$1 billion in cash and stock.
  
−
'''TripAdvisor''' was founded in 2000 by Stephen Kaufer
+
Facebook's initial public offering came in 2012, at a share price of $38. The company was valued at $104 billion.
  
−
'''Twitter''' was created in 2006 by Jack Dorsey, Evan Williams, Biz Stone and Noah Glass
+
Facebook acquired Oculus, a VR headset startup, in 2014. The Oculus Rift was the first virtual reality headset to provide a realistic experience at an accessible price.
  
−
Video app Vine allows users to record and share six-second clips
+
WhatsApp was acquired by Facebook in 2014 for approximately US$19.3 billion
  
−
Maximum length of a tweet is 140 characters
+
Sheryl Sandberg was chief operating officer of Facebook from 2008 to 2022.
  
−
Dick Costolo – CEO of Twitter
+
In October 2021, Facebook rebranded itself as Meta Platforms, Inc., or simply "Meta" in an attempt to own the Metaverse, a concept for a 3D version of the internet. This change does not affect the name of the Facebook social networking service itself, instead being like the creation of Alphabet as Google's parent company in 2015.
  
−
As of December 2013<sup>[update]</sup>, Twitter had a market capitalization of $32 billion
+
For information on the Facebook website see [[Lifestyle/Social Media and the Internet]]
  
−
As of July 2014, Twitter has more than 500 million users, out of which more than 271 million are active users
+
'''Microsoft'''
  
−
Vine lets users record and edit up to six-second-long looping video clips and revine, or share others' posts with followers. Owned by Twitter
+
Microsoft was founded in 1975 in Albuquerque by Bill Gates and Paul Allen. Microsoft is a portmanteau of “microcomputer software”. The company headquarters are in Redmond, Washington.
  
−
'''Tumblr''' is a microblogging platform and social networking website. Founded by David Karp in 2007. Sold to Yahoo! in 2013
+
Steve Ballmer replaced Bill Gates as CEO in 2000, and in 2014 Satya Nadella took over as CEO.
  
−
'''Webvan''' was an online ‘credit and delivery’ grocery business that went bankrupt in 2001. It was headquartered in Foster City, California
+
In April 2019, Microsoft became the third US public company to be valued at over $1 trillion after Apple and Amazon.
  
−
'''Wikipedia''' was founded by Jimmy Wales in 2001
+
Microsoft was the world's largest software maker by revenue as of 2022.
  
−
Wikimedia Foundation – parent company of Wikipedia
+
Microsoft bought Skype Technologies for $8.5 billion in 2011.
  
−
Wikivoyage travel guide was launched in 2012
+
Microsoft bought LinkedIn for $26 billion in 2016.
  
−
With 18 billion page views and nearly 500 million unique visitors a month, Wikipedia trails just Yahoo, Facebook, Microsoft and Google, the largest with 1.2 billion unique visitors
+
GitHub is a platform and cloud-based service for software development and version control using Git. It has been a subsidiary of Microsoft since 2018.
  
−
'''Wonga.com''' was founded by Errol Damelin and Jonty Hurwitz in 2007
+
Microsoft HoloLens is an augmented reality (AR)/mixed reality (MR) headset developed and manufactured by Microsoft.
  
−
'''Yahoo!''' Was founded by David Filo and Jerry Yang, in 1995
+
Microsoft Azure is a suite of cloud computing services.
  
−
Marissa Mayer – CEO of Yahoo!
+
Visual Studio is an integrated development environment (IDE) from Microsoft. It is used to develop computer programs including websites, web apps, web services and mobile apps.
  
−
'''YouGov''' is a British internet-based market research firm. It was launched in 2000 by Stephan Shakespeare (CIO) and Nadhim Zahawi (CEO)
+
Microsoft Store is a digital platform for the purchase and download of apps, games, and software from Microsoft and its partners.
  
−
'''YouTube'''. The first YouTube video was entitled ''Me at the zoo'', and shows Jawed Karim at the San Diego Zoo. The video was uploaded on April 23, 2005
+
Encarta is a discontinued digital multimedia encyclopaedia published by Microsoft from 1993 to 2009.
  
−
YouTube was created in 2005 by three former PayPal employees – Steve Chen, Chad Hurley and Jawed Karim
+
Microsoft Mobile was a subsidiary of Microsoft involved in the development and manufacturing of mobile phones. It was established in 2014 following the acquisition of Nokia's Devices and Services division by Microsoft. The company sold the Lumia range of phones, but in 2016 Microsoft abandoned its mobile business.

Latest revision as of 19:57, 31 August 2023

Computing

History of Computing

1801

Joseph Jacquard created a punch-card programmable loom which greatly simplified the weaving process.

1837

The Analytical Engine was a proposed mechanical general-purpose computer designed by English mathematician and computer pioneer Charles Babbage. It was first described in 1837 as the successor to Babbage's Difference Engine.

1843

Ada Lovelace, the daughter of Lord Byron, worked closely with Charles Babbage. She wrote a plan for how the Bernoulli numbers might be calculated, which is widely regarded as the first computer program.

1936

Alan Turing invented the Turing Machine, a mathematical model of computation describing an abstract machine that manipulates symbols on a strip of tape according to a table of rules. Computers to this day emulate this functionality of reading simple binary input and computing a logical output. This relatively simple machine enables the computation of any algorithm.

1944

The Colossus machines were electronic computing devices used by British codebreakers to read encrypted German messages during World War II. These were the world's first programmable, digital, electronic, computing devices. They used vacuum tubes (thermionic valves) to perform the calculations. Colossus was designed by engineer Tommy Flowers

1946

ENIAC (Electronic Numerical Integrator and Computer) was the first general-purpose electronic computer. It was designed for the US Army.

1947

William Shockley of Bell Labs invented the first transistor.

1949

EDSAC (Electronic Delay Storage Automatic Calculator) was constructed by Maurice Wilkes and his team at the University of Cambridge Mathematical Laboratory. Later the project was supported by J. Lyons & Co. Ltd., who were rewarded with the first commercially applied computer, LEO I (Lyons Electronic Office I), based on the EDSAC design.

1951

Ferranti Mark I was the world's first commercially available general-purpose electronic computer. The first machine was delivered to the University of Manchester in February 1951, just ahead of the UNIVAC (Universal Automatic Computer) which was delivered to the United States Census Bureau a month later.

1958

Jack Kilby and Robert Noyce created the first integrated circuit, commonly known as a microchip. An integrated circuit consists of electronic circuits mounted onto a semiconductor.

1964

The CDC 6600 was manufactured by Control Data Corporation. Generally considered to be the first successful supercomputer, it was designed by Seymour Cray.

1964

Douglas Engelbart invented the computer mouse. It was built of a wooden case with two wheels and a button on top.

1969

ARPANET was the first wide-area packet-switched network with distributed control. It was the precursor to the Internet.

1971

Intel released the first microprocessor, the 4-bit Intel 4004.

1971

Email was invented by Ray Tomlinson.

1974

The term “Internet” was first used.

1975

Microsoft was founded by Bill Gates and Paul Allen, to develop and sell BASIC interpreters for the Altair 8800.

1976

Apple-1 was released. It was an 8-bit computer designed by Steve Wozniak. To finance its creation, Steve Jobs sold his Volkswagen Bus, and Wozniak sold his HP-65 calculator. Production was discontinued in September 1977 after the introduction of its successor, the Apple II.

1981

IBM launched its first personal computer, the IBM Model-5150.

1982

Sinclair ZX spectrum was released.

1984

Apple Mac was released.

1985

Microsoft released its first version of the Windows operating system.

1989

The World Wide Web was created by Tim Berners-Lee.

1990

Microsoft Office was released.

1995

Java programming language was developed by James Gosling of Sun Microsystems.

1998

Google was founded by Larry Page and Sergey Brin while they were PhD students at Stanford University.

1998

The first quantum computer was created.

2012

Raspberry Pi single-board computer was released at a cost of £35. By December 2019, a total of 30 million devices had been sold. It was designed for the teaching of basic computer science in schools but has also been used in commercial applications.

Personal Computers

Altair 8800 was the first commercially successful personal computer. It was advertised on the cover of Popular Electronics in January 1975 and was sold by mail order. It was designed by MITS (Micro Instrumentation and Telemetry Systems) and was based on the Intel 8080 processor.

Commodore PET was released in 1977 by Commodore International. It contained an 8-bit microprocessor and included a version of BASIC in read-only memory. PET was a backronym of Personal Electronic Transactor. 219,000 units were sold.

IBM Personal Computer (model 5150, commonly known as the IBM PC) was the first microcomputer released in the IBM PC model line. Based on the Intel 8088 microprocessor. The operating system was IBM PC DOS, developed by Microsoft. The starting price was US$1,565 (equivalent to $5,040 in 2022).

Osborne 1 was the first commercially successful portable computer. It was released in 1981 and weighed 11 kg. The microprocessor was a Zilog Z80 and the operating system was CP/M.

BBC Micro was a series of microcomputers designed and built in the 1980s by Acorn Computers, headed by Hermann Hauser and Chris Curry, for the BBC Computer Literacy Project. The CPU was an 8-bit MOS Technology 6502 and the programming language was BBC BASIC. An accompanying 1982 television series, The Computer Programme, featuring Chris Serle learning to use the machine, was broadcast on BBC2.

ZX Spectrum was developed by Sinclair Research and was Britain's best-selling microcomputer, selling 5 million units. The initial cost of the 16 KB machine was £125. It was the successor to the ZX80 and ZX81 machines. The original ZX Spectrum had a rubber keyboard. The microprocessor was an 8-bit Z80. Sinclair licensed the Spectrum design to Timex Corporation in the United States.

Commodore 64 was an 8-bit computer released in 1982. It was the highest-selling single computer model of all time, with estimates placing the number sold between 12.5 and 17 million units. The machine took its name from its 64 kilobytes of RAM.

Operating Systems

CP/M (Control Program for Microcomputers) was created in 1974 for Intel 8080/85-based microcomputers by Gary Kildall of Digital Research, Inc. It was widely used in business through the late 1970s and into the mid-1980s but was eventually displaced by DOS following the 1981 introduction of the IBM PC.

MS-DOS (Microsoft Disk Operating System) is an operating system for x86-based personal computers. IBM PC DOS is a rebranded version of MS-DOS. In 1980 IBM approached Digital Research, at Bill Gates' suggestion, to license a forthcoming version of CP/M for its new product, the IBM Personal Computer. Upon the failure to obtain a signed non-disclosure agreement, the talks failed, and IBM instead contracted with Microsoft to provide an operating system. The resulting product, MS-DOS, soon began outselling CP/M.

Microsoft Windows is the most popular desktop operating system in the world, with a 70% market share.

List of Microsoft Windows versions

Version Release date
Windows 1.0 1985
Windows 2.0 1987
Windows 2.1x 1988
Windows 3.0 1990
Windows 3.1 1992
Windows NT 3.1 1993
Windows 3.2 1993
Windows NT 3.5 1994
Windows NT 3.51 1995
Windows 95 1995
Windows NT 4.0 1995
Windows 98 1998
Windows 2000 2000
Windows ME 2000
Windows XP 2001
Windows XP Professional x64 Edition 2005
Windows Vista 2007
Windows 7 2009
Windows 8 2012
Windows 8.1 2013
Windows 10 2015
Windows 11 2021

Windows 1.0 replaced MS-DOS.

Windows NT is a multiprocessing and multi-user operating system.

Windows 95 introduced the Start menu. The Windows 95 release included a commercial featuring The Rolling Stones' 1981 single "Start Me Up" (a reference to the Start button). Microsoft paid the Rolling Stones $3 million for the rights to “Start Me Up”. Windows 95 was bundled as a standalone operating system that did not require a separate DOS license.

Windows ME (Millennium Edition) became infamously known by many as one of the worst versions of Windows ever released, mainly due to stability problems.

Windows Vista received poor reviews, mainly for its much higher hardware requirements and perceived slowness compared to Windows XP.

Windows 8 received a mostly negative reception. The new user interface of the operating system was widely criticized for being confusing and unintuitive.

Windows 10 reintroduced the Start menu, and incorporated Microsoft's intelligent personal assistant, Cortana. Internet Explorer was replaced with Microsoft Edge.

Mac OS was developed for the Macintosh family of personal computers from 1984 to 2001, starting with System 1 and ending with Mac OS 9. The Macintosh operating system is credited with having popularized the graphical user interface concept.

macOS succeeded the classic Mac OS. In 1985 Apple cofounder Steve Jobs had left Apple and started another company, NeXT, developing the NeXTSTEP platform that would later be acquired by Apple to form the basis of macOS.

List of macOS versions

Version Release name Release date
Mac OS X 10.0 Cheetah 2001
Mac OS X 10.1 Puma 2001
Mac OS X 10.2 Jaguar 2002
Mac OS X 10.3 Panther 2003
Mac OS X 10.4 Tiger 2005
Mac OS X 10.5 Leopard 2007
Mac OS X 10.6 Snow Leopard 2009
Mac OS X 10.7 Lion 2011
Mac OS X 10.8 Mountain Lion 2012
Mac OS X 10.9 Mavericks 2013
Mac OS X 10.10 Yosemite 2014
Mac OS X 10.11 El Capitan 2015
macOS 10.12 Sierra 2016
macOS 10.13 High Sierra 2017
macOS 10.14 Mojave 2018
macOS 10.15 Catalina 2019
macOS 11 Big Sur 2020
macOS 12 Monterey 2021
macOS 13 Ventura 2022
macOS 14 Sonoma Announced on 5 June 2023

Unix is a family of multi-user computer operating systems that derive from the original AT&T Unix, whose development was started in 1969 at the Bell Labs research centre by Kenneth Thompson and Dennis Ritchie.

Almost the entire operating system is written in the C programming language.

Linux is a family of open-source Unix-like operating systems based on the Linux kernel, an operating system kernel first released in 1991 by Finnish-American software engineer Linus Torvalds.

Popular Linux distributions include Debian, Fedora Linux, and Ubuntu. Commercial distributions include Red Hat Enterprise Linux and SUSE Linux Enterprise.

Tux is the penguin mascot of the Linux kernel, and is based on an image created by Larry Ewing in 1996.

ChromeOS is a Linux-based operating system developed and designed by Google. Laptops or tablets running ChromeOS are known as Chromebooks.

Programming languages

FORTRAN (Formula Translation) was originally developed by IBM in the 1950s for scientific and engineering applications, and subsequently came to dominate scientific computing.

COBOL was designed in 1959 by CODASYL and was partly based on the programming language FLOW-MATIC designed by Grace Hopper. It was created as part of a US Department of Defense effort to create a portable programming language for data processing. It is primarily used in business, finance, and administrative systems.

BASIC (Beginners' All-purpose Symbolic Instruction Code) was created by John Kemeny and Thomas Kurtz at Dartmouth College in 1963. It became the de facto programming language for home computer systems that usually had a BASIC interpreter installed by default.

Pascal is a procedural programming language, designed by Niklaus Wirth and intended to encourage good programming practices using structured programming and data structuring. It is based on the ALGOL 60 language.

Ada is an object-oriented high-level programming language designed for the United States Department of Defense (DoD). Ada was named after Ada Lovelace.

C was developed by Dennis Ritchie between 1969 and 1973 at AT&T Bell Labs to construct utilities running on Unix. C is widely used for systems programming in implementing operating systems and embedded system applications.

C++ was developed by Bjarne Stroustrup starting in 1979 at Bell Labs. It is as an extension of the C programming language and has object-oriented features.

C# is based on the C family of languages, and has similarities to C, C++, Java, and JavaScript. It was designed by Anders Hejlsberg from Microsoft in 2000.

Java is a high-level, object-oriented programming language used to create complete applications. The language is platform independent, allowing it to run on any device that supports its environment. Java was originally developed by James Gosling as a core component of Sun Microsystems' Java platform. The Java logo is a cup of coffee, and the mascot is a cartoon character named Duke.

Python is a general-purpose programming language created by Dutch programmer Guido van Rossum and first released in 1991. Python's name is derived from the British comedy troupe Monty Python.

Ruby was developed by Yukihiro "Matz" Matsumoto in Japan and released in 1995. It was designed with an emphasis on programming productivity and simplicity.

Go is an object-oriented programming language that Google created in 2009 for networking and infrastructure. It has evolved into a general-purpose language used in a wide range of applications.

Kotlin was designed by JetBrains, a company based in Prague. Kotlin is designed to interoperate fully with Java, and is used by Android app developers. The name comes from Kotlin Island, near Saint Petersburg.

R is an open-source programming language for statistical computing and data analysis.

JavaScript is a dynamic scripting language that is one of the core technologies of the World Wide Web. It was designed by Brendan Eich of Netscape and released in 1995.

PHP is a widely-used open source and general-purpose scripting language that is especially suited for web development. PHP’s popularity is owed to the fact that it was one of the first server-side languages that developers could embed into HTML. It was created by Rasmus Lerdorf in 1995. PHP was originally an abbreviation of Personal Home Page, but it now stands for the recursive initialism PHP: Hypertext Preprocessor.

Computer security

Types of attack –

Malware ('malicious software') is any program or file that is harmful to a computer user. Malware can be divided into a number of types –

Virus - replicates itself by modifying other computer programs and inserting its own code into those programs. Once downloaded, opened or executed, the virus can piggyback onto programs to corrupt data.

Worm - a standalone program that replicates itself in order to spread to other computers. Creeper was the first computer worm, while Reaper was the first antivirus software, designed to eliminate Creeper. Reaper was created by Ray Tomlinson in 1972.

Stuxnet is a computer worm discovered in 2010. It initially spread via Microsoft Windows, and targeted Siemens industrial software and equipment. Different variants of Stuxnet targeted five Iranian organizations, with the probable target widely suspected to be uranium enrichment infrastructure in Iran.

Trojan horse - any malware that misleads users of its true intent by disguising itself as a standard program. It is unable to replicate itself.

Ransomware - comprises a class of malware which restricts access to the computer system that it infects, and demands a ransom paid to the creator of the malware in order for the restriction to be removed. Ransomware attacks are typically carried out using a Trojan disguised as a legitimate file that the user is tricked into downloading or opening when it arrives as an email attachment.

Rogue software - a form of malware and internet fraud that misleads users into believing there is a virus on their computer and aims to convince them to pay for a fake malware removal tool that actually installs malware on their computer.

Spyware - malware used to gain access to a user’s systems and monitor their data, files, and behavior. Spyware is frequently associated with advertising.

Terms used in connection with attacks –

Phishing – the fraudulent practice of sending emails purporting to be from reputable companies in order to induce individuals to reveal personal information, such as passwords and credit card numbers.

Smishing – similar to phishing, but the messages are sent via text messages rather than emails.

Vishing – similar to phishing, but the messages are sent via phone calls or voice mails rather than emails. Also known as voice phishing.

Whaling – a type of phishing attack where a particularly important person in an organisation is targeted.

Spoofing – a sort of fraud in which someone forges the sender’s identity and poses as a reputable source in order to obtain personal information, acquire money, spread malware, or steal data.

Doxing – short for "dropping dox," is an online attack in which hackers dig up personal information and documents – hence, the “dox” part of “dropping dox” – to expose the real identities of people hoping to remain anonymous.

Clickjacking – a malicious technique of tricking a user into clicking on something different from what the user perceives, thus potentially revealing confidential information.

Denial of service attack (DoS attack) – a cyber-attack in which the perpetrator seeks to make a machine or network resource unavailable to its intended users by temporarily or indefinitely disrupting services of a host connected to a network. In a distributed denial-of-service attack (DDoS attack), the incoming traffic flooding the victim originates from many different sources, and is usually performed by a group of Internet-connected devices known as a botnet (a portmanteau of the words "robot" and "network").

Hackers

A hacker is able to subvert computer security. If doing so for malicious purposes, the person can also be called a cracker. There are three types of hackers –

Black hat – someone who maliciously searches for and exploits vulnerabilities in computer systems or networks, often using malware and other hacking techniques to do harm.

White hat – a security specialist hired to find vulnerabilities in software, hardware and networks that black hats may find and target. Unlike black hats, white hats only hack networks when legally permitted to do so. Also known as ethical hackers.

Grey hat – someone who exploits security vulnerabilities without malicious intent, like a white hat, but may use illegal methods to find flaws.

Anti-virus software

Norton AntiVirus

Founded by Peter Norton, Norton AntiVirus has been developed and distributed by Symantec since 1990. The product runs on Microsoft Windows, Linux, and macOS.

The current Norton product, Norton 360, was developed by Gen Digital (formerly Symantec Corporation).

McAfee

John McAfee created VirusScan, the first commercial anti-virus software, in 1987.

In 2000, McAfee/Network Associates was the leading authority in educating and protecting people against the Love Bug or ILOVEYOU virus, one of the most destructive computer viruses in history.

Intel acquired McAfee in 2010.

Bitdefender

Bitdefender is a Romanian cybersecurity technology company headquartered in Bucharest. The company was founded in 2001 by the current CEO and main shareholder, Florin Talpes.

Kaspersky Anti-Virus

Kaspersky Lab is a Russian computer security company, co-founded by Natalia Kaspersky and Eugene Kaspersky in 1997, offering anti-virus, anti-spyware, anti-spam, and anti-intrusion products.

In 2016 the software has about 400 million users and had the largest market-share of cybersecurity software vendors in Europe.

The U.S. Department of Homeland Security banned Kaspersky products from all government departments in 2017.

Avast Antivirus

Avast was founded in Prague in 1988. The software is software are sold on a freemium model, where basic security features are free, but more advanced features require purchasing a premium version. The free version is also supported by ads.

In 2017 it had the largest share of the market for antivirus applications.

AVG was a cybersecurity software company founded in 1991 and it merged into Avast following an acquisition in 2017.

Cloud computing

Cloud computing is the on-demand availability of computing resources, such as storage and infrastructure, as services over the internet. The market is currently dominated by Amazon Web Services, Microsoft Azure, and Google Cloud.

iCloud allows users to store data such as music files for download to multiple devices such as iPhones, iPods, iPads, and personal computers running Mac OS X or Microsoft Windows on computer servers owned by Apple

File hosting

A file-hosting service is a hosting service on the internet that stores user data, like images, videos, and other types of data files. These services are secure and allow a user to store their files safely on the internet. Since the files are stored on the internet, they can be accessed from anywhere if the user has internet access.

Microsoft OneDrive is a file hosting service operated by Microsoft. First launched in 2007, it enables registered users to share and synchronize their files. OneDrive also works as the storage backend of the web version of Microsoft Office. OneDrive offers 5 GB of storage space free of charge.

Quantum computing

A quantum computer is a device for computation that makes direct use of quantum mechanical phenomena, such as superposition and entanglement, to perform operations on data. Quantum computers are different from traditional computers based on transistors.

In quantum computing, a qubit or quantum bit is a unit of quantum information.

The field of quantum computing was initiated by the work of Paul Benioff and Yuri Manin in 1980, Richard Feynman in 1982, and David Deutsch in 1985.

IBM Quantum System One was the first commercial quantum computer.

It was hoped that a quantum computer could perform some calculations exponentially faster than any modern "classical" computer, but in 2023 classical computers outperform quantum computers for all real-world applications.

Office productivity software

Word processing

WordPerfect was the dominant player in the word processor market in the 1980s. Following a failed release for Microsoft Windows, Microsoft Word took over the market.

Microsoft Word was first released in 1983 under the name Multi-Tool Word for Xenix systems. Commercial versions of Word are licensed as a standalone product or as a component of Microsoft Office. In the top menu, the icon for the save button is a floppy disk.

Spreadsheet

VisiCalc (visible calculator) was the first spreadsheet computer program for personal computers, originally released for the Apple II in 1979. When Lotus 1-2-3 was launched in 1983, taking full advantage of the expanded memory and screen of the PC, VisiCalc sales practically ended overnight.

Lotus 1-2-3 was a state-of-the-art spreadsheet and the standard throughout the 1980s. Due to the lack of a graphical user interface Lotus was surpassed by Microsoft in the early 1990s and never recovered.

Microsoft Excel was launched in 1987. Excel was one of the first spreadsheet programs to use a graphical interface with pull down menus. The first version was only released for the Macintosh. It consists of 1048576 rows and 16384 columns, a row and column together make a cell.

Presentation program

Microsoft PowerPoint was created by Forethought, Inc. in 1987, initially for Macintosh computers only. Microsoft acquired PowerPoint three months after it appeared. PowerPoint was originally designed to provide visuals for group presentations within business organisations. PowerPoint's worldwide market share of presentation software is around 95%.

Microsoft Office

Office was first announced by Bill Gates in 1988, at COMDEX in Las Vegas. The first version of Office contained Word, Excel, and PowerPoint. Later versions included an email client (Outlook), a database management system (Access), and a desktop publishing app (Publisher). In Microsoft Office 2007, Calibri replaced Times New Roman as the default typeface in Word and replaced Arial as the default in PowerPoint, Excel, and Outlook. The branding Office 365 was first introduced in 2010 to refer to subscription-based software as a service platform for the corporate market. In October 2022, Microsoft announced that it would rebrand the product as "Microsoft 365".

Laptops

Acer

Acer is a Taiwanese company founded in 1976.

Current models – Aspire, Chromebook, Spin, Swift.

Apple

The MacBook Air is Apple's least expensive notebook computer and was released in 2008. The MacBook Pro is Apple's higher-end notebook available in 13-inch, 14-inch, and 16-inch configurations and was released in 2006.

Current models – MacBook Pro, MacBook Air.

Asus

Asus is a Taiwanese company founded in 1989.

Current models – Chromebook, Flip, Zenbook.

Lenovo

Lenovo is a Chinese company founded as Legend in 1984, and acquired IBM's personal computer business in 2005, including the ThinkPad laptop. The IdeaPad line of laptops was introduced in 2008. Lenovo has been the world's largest PC vendor by unit sales in every year since 2013, with the exception of 2017.

Current models – IdeaPad.

Dell

Dell was founded by Michael Dell in 1984 and is the world's 3rd-largest PC vendor by unit sales. The first Inspiron laptop model was introduced in 1997.

Current models – Inspiron, XPS.

HP

HP Inc. was formerly known as Hewlett-Packard. It is the world's 2nd-largest PC vendor by unit sales.

Current models – Envy, Pavilion, Chromebook, ProBook.

Microsoft

Microsoft Surface is a series of touchscreen-based personal computers, tablets, and interactive whiteboards designed and developed by Microsoft, most of them running the Windows operating system. They are designed to be premium devices.

Current models – Surface.

Tablet computers

A tablet is a mobile device, typically with a mobile operating system and touchscreen display processing circuitry, and a rechargeable battery.

A 2-in-1 PC is a hybrid or combination of a tablet and laptop computer that has features of both. Distinct from tablets, 2-in-1 PCs all have physical keyboards.

A phablet is a mobile device combining or straddling the size formats of smartphones and tablets. The Sony Xperia Z Ultra is a 2013 Android phablet designed and manufactured by Sony Mobile

Market share (2022) – Apple 37%, Samsung 18%, Amazon 11%

Apple

The iPad was released in 2010. It features a multi-touch screen and a virtual onscreen keyboard. The iOS operating system was switched to iPadOS in 2019. Total sales exceed 670 million units.

iPad range consists of the original iPad lineup and three other products –

iPad Mini – a smaller tablet with screen sizes of 7.9 inches and 8.3 inches.

iPad Air – uses the Apple M1 chip.

iPad Pro – professional model with a screen size of 12.9 inches. Uses the Apple M2 chip.

Amazon

The Amazon Fire is built with Quanta Computer in Taiwan. The Kindle Fire was first released in 2011, featuring a colour 7-inch multi-touch and running on Fire OS. In 2014, when the fourth generation was introduced, the name "Kindle" was dropped. In later generations, the Fire tablet is also able to convert into a Smart speaker with interaction by voice command through Alexa.

Samsung

The Samsung Galaxy Tab is a line of Android OS tablet computers first released in 2010.

Internet

ARPANET (Advanced Research Projects Agency Network), created by the Defense Advanced Research Projects Agency (DARPA) of the United States Department of Defense, was the world's first operational packet switching network, and the predecessor of the contemporary global Internet. The packet switching of the ARPANET was based on designs by Lawrence Roberts, of the Lincoln Laboratory.

Internet protocol suite, commonly known as TCP/IP, is a framework for organizing the set of communication protocols used in the Internet. The foundational protocols in the suite are the Transmission Control Protocol (TCP), the User Datagram Protocol (UDP), and the Internet Protocol (IP).

Vinton Gray ‘Vint’ Cerf is an American Internet pioneer, who is recognized as one of ‘the fathers of the Internet’, sharing this title with Bob Kahn, for the invention of TCP/IP.

The Internet has no single centralized governance in either technological implementation or policies for access and usage; each constituent network sets its own policies. The overarching definitions of the two principal name spaces on the Internet, the Internet Protocol address (IP address) space and the Domain Name System (DNS), are directed by a maintainer organization, the Internet Corporation for Assigned Names and Numbers (ICANN).

Country code top-level domain (ccTLD) is an Internet top-level domain generally used or reserved for a country, sovereign state, or dependent territory identified with a country code.

Internet of Things (IoT) is the network of physical objects or "things" embedded with electronics, software, sensors, and network connectivity, which enables these objects to collect and exchange data.

World Wide Web

The World Wide Web, or Web, is an information system on the internet which allows documents to be connected to other documents by hypertext links, enabling the user to search for information by moving from one document to another.

The Web was invented by Tim Berners-Lee at CERN in 1999. He also made the world’s first web browser and web server. The first website built (info.cern.ch) was at CERN, and was first put online on 6 August 1991.

HTML (Hyper Text Markup Language) – the publishing format for the web. It includes the ability to format documents and link to other documents and resources.

URL (Uniform Resource Locator) – a kind of 'address' that is unique to each resource on the web. It could be the address of a webpage or an image file.

HTTP (Hypertext Transfer Protocol) – allows HTML documents to be requested and transmitted between browsers and web servers via the internet.

HTTPS (Hypertext Transfer Protocol Secure) – an extension of the Hypertext Transfer Protocol. It uses encryption for secure communication over a computer network, and is widely used on the Internet.

Web browser – a tool that enables users to surf and access websites that are on the internet.

Web server – a computer where files are stored which can be accessed via the internet using HTTP or HTTPS.

Web 2.0 – the current state of the internet that has more user-generated content and usability for end-users than Web 1.0.

Cookie – a small piece of data sent from a website and stored on the user's computer by the user's web browser while the user is browsing.

Website development

LAMP is an acronym for an archetypal model of web service solution stacks, originally consisting of largely interchangeable components:

·          Linux operating system

·          Apache HTTP Server

·          MySQL relational database management system

·          PHP programming language

The ‘P’ in Lamp can also stand for Python or Perl

JavaScript is the dominant client-side scripting language of the Web, with 98% of all websites using it for this purpose. Scripts are embedded in or included from HTML documents. All major web browsers have a built-in JavaScript engine that executes the code on the user's device.

HTML is a markup language that web browsers use to interpret and compose text, images, and other material into visible or audible web pages.

XML (Extensible Markup Language) is a markup language and file format for storing, transmitting, and reconstructing arbitrary data.

CSS (Cascading Style Sheets) is a style sheet language used for describing the presentation of a document written in a markup language such as HTML or XML.

Ruby on Rails is a server-side web application framework written in Ruby.

WordPress is among the most popular content management systems. It is written in PHP.

Companies

Adobe Inc. was founded by John Warnock and Charles Geschke in 1982. Products include Adobe Photoshop image editing software, Adobe Illustrator vector-based illustration software, Adobe Acrobat Reader, and the Portable Document Format (PDF) that is based on the PostScript page description language.

ARM was founded as Advanced RISC Machines, ARM, a joint venture between Acorn Computers, Apple Computer and VLSI Technology. Based in Cambridge, its primary business is the design of ARM processors (CPUs). Since 2016, it has been owned by Japanese conglomerate SoftBank Group.

Cisco Systems was founded in 1984 by Leonard Bosack and Sandy Lerner. John Chambers was CEO from 1995 to 2015. Cisco is known particularly for its networking hardware.

Compaq was founded in 1982 and rose to become the largest supplier of PC systems during the 1990s before being overtaken by Dell in 2001. The company was acquired for US$25 billion by HP in 2002. The brand remained in use by HP for lower-end systems until 2013 when it was discontinued.

Hewlett-Packard (HP) was founded in 1939 by Bill Hewlett and David Packard. HP was the world's leading PC manufacturer from 2007 until 2013, when Lenovo moved ahead of HP. In 2015 the former Hewlett-Packard Company changed its name to HP Inc. and Hewlett Packard Enterprise was spun off as a newly created company.

Intel (From integrated and electronics) was founded in 1968. It is one of the world's largest semiconductor chip manufacturer by revenue, and is one of the developers of the x86 series of instruction sets found in most personal computers.

The Intel 4004 chip was released by Intel in 1971. It was the first commercially available microprocessor by Intel.

The x86 family is based on the Intel 8086 microprocessor.

International Business Machines Corporation (IBM) was founded in 1911 as the Computing-Tabulating-Recording Company. During the 1960s and 1970s, the IBM mainframe, exemplified by the System/360, was the dominant computing platform, and the company produced 80 percent of computers in the U.S. and 70 percent of computers worldwide. After pioneering the multipurpose microcomputer in the 1980s, IBM began losing its market dominance to emerging competitors.

IBM is one of 30 companies in the Dow Jones Industrial Average.

Infosys is headquartered in Bangalore. Infosys is the second-largest Indian IT company, after Tata Consultancy Services.

Logitech was founded in Switzerland in 1981. Products include keyboards, mice, tablet accessories, headphones and headsets, webcams, and Bluetooth speakers. In 2008, Logitech announced that it had manufactured one billion computer mice since 1985.

Oracle Corporation was founded in Redwood City, California and is now headquartered in Austin, Texas. Larry Ellison, a co-founder of Oracle, has served as Oracle's CEO since its founding in 1977. In 2020, Oracle was the third-largest software company in the world by revenue and market capitalization. The Oracle relational database management system (RDBMS) uses the Structured Query Language (SQL).

SAP is a German software company founded in 1972. It is the world's leading enterprise resource planning (ERP) software vendor and the largest non-American software company by revenue.

Tata Consultancy Services (TCS) was founded in 1968 and is part of the Tata Group. TCS is the second largest Indian company by market capitalization.

VMWare develops virtualization software, that creates an abstraction layer over computer hardware that allows the hardware elements of a single computer to be divided into multiple virtual computers, commonly called virtual machines (VMs).

Networks and Mobile Phones

Cellular Networks

A Cellular network or Mobile network is a radio network distributed over land areas called cells, each served by at least one fixed-location transceiver, known as a cell site or base station. In a cellular network, each cell uses a different set of frequencies from neighboring cells, to avoid interference and provide guaranteed bandwidth within each cell.

There are five generations of cellular networking technology –

1G - the first commercial cellular network was launched in Japan by Nippon Telegraph and Telephone in 1979. 1G was introduced to the USA in 1983.

2G - launched on the Global System for Mobile Communications (GSM) in Finland in 1991. It provided significant mobile talk advancements, introducing encrypted calls. While radio signals on 1G networks are analog, radio signals on 2G networks are digital. The first SMS text message was sent from a computer to a mobile phone in 1992 in the UK, while the first person-to-person SMS from phone to phone was sent in Finland in 1993.

3G - launched in 2001, 3G offered better voice quality and faster data transfer, allowing users to surf the internet and stream music on a mobile phone. Universal Mobile Telecommunications System (UMTS) is a third-generation mobile cellular system for networks based on the GSM standard.

4G - the first 4G networks were commercially deployed in Norway and Sweden in 2009, and have since been deployed throughout most parts of the world. Starting at a minimum of 12.5 Mbps, 4G provided high-quality video streaming/chat, fast mobile web access, HD videos, and online gaming. 4G has speeds of up to 150 Mbit/s download.

5G - cellular phone companies began deploying worldwide in 2019. 5G has higher bandwidth to deliver faster speeds than 4G and can thus connect more different devices. 5G is capable of delivering significantly faster data rates than 4G, with peak data rates of up to 20 gigabits per second (Gbps).

Wi-Fi Networks

Wi-Fi stands for Wireless Fidelity. It is used to create a wireless network of devices to access the internet. It follows IEEE 802.11 standards. Wi-Fi networks use multiple bands of radio waves and microwaves to transmit data among the devices wirelessly. In WiFi networks, Internet service is accessible only where a WiFi connection is present.

The current generation wireless standard is Wi-Fi 6.

Mobile phones

History

The first hand-held cell phone was demonstrated by John F. Mitchell and Dr. Martin Cooper of Motorola in 1973, using a handset weighing around 2kg. In 1983, the DynaTAC 8000x was the first to be commercially available. From 1983 to 2014, worldwide mobile phone subscriptions grew from zero to over 7 billion.

It was claimed that Ernie Wise made the first mobile phone call in the UK on 1 January 1985 from St Katharine Docks, East London, to Vodafone's Headquarters in Newbury.

The first SIM (Subscriber Identity Module) card was made in 1991 by Munich smart card maker Giesecke & Devrient.

The first Short Message Service (SMS) text message was sent from a computer to a mobile phone in 1992 in the UK while the first person-to-person SMS from phone to phone was sent in Finland in 1993.

Symbian was an operating system used in Nokia phones. It was the most popular smartphone operating system on a worldwide average until the end of 2010, when it was overtaken by Android.

Android is developed by a consortium of developers known as the Open Handset Alliance, though its most widely used version is primarily developed by Google. It was unveiled in 2007, with the first commercial Android device, the HTC Dream, being launched in 2008.

Manufacturers

Apple

The first-generation iPhone was released in June 2007. It incorporated a 3.5-inch multi-touch display and had a starting price of US$499.

The iPhone 3G was released in 2008 and introduced faster 3G connectivity, and a lower starting price of US$199.

The iPhone 4 was marketed as the "world's thinnest smartphone" and introduced the Retina display.

The iPhone 4s was announced in 2011 and introduced the Siri virtual assistant.

The iPhone 5s introduced the Touch ID fingerprint authentication sensor.

The iPhone 14 and iPhone 14 Plus are the sixteenth and latest generation of iPhones, and were announced during Apple Event, Apple Park in Cupertino, California, in September 2022. The price of the iPhone 14 starts at $799.

The iPhone runs on the iOS operating system. Major versions of iOS are released annually. The current stable version, iOS 16, was released in September 2022.

The iPhone accounts for around 16% of global smartphone market share.

Blackberry

The line of BlackBerry smartphones was developed and maintained by the Canadian company BlackBerry Limited (formerly known as Research In Motion, or RIM) from 1999 to 2016, after which it was licensed to various companies. The company was founded by Mike Lazaridis.

The phones were known for having a physical QWERTY keyboard.

At its peak in 2011, there were 85 million BlackBerry subscribers worldwide, but the rise of Google's Android platform and Apple's iOS caused it to decline in popularity by nearly three-quarters.

BlackBerry phones are now officially defunct and are unable to function.

Google

The Nexus line of Android phones started out in 2010 and reached its end in 2016, replaced by Google Pixel.

The current models in the Pixel line are the Pixel 7 and Pixel 7 Pro.

Huawei

Huawei was founded in 1987 by Ren Zhengfei and is headquartered in Shenzhen.

Their portfolio of phones includes both high-end smartphones, its Huawei Mate series and Huawei P series, and cheaper handsets that fall under its Honor brand.

Huawei is currently banned from doing business with US companies as the US government considers Huawei to be a national security threat.

Motorola

Motorola MicroTAC is a cellular phone first manufactured as an analog version in 1989. The MicroTAC introduced a new "flip" design, where the "mouthpiece" folded over the keypad. This set the standard and became the model for modern flip phones today. Its predecessor was the much larger Motorola DynaTAC and it was succeeded by the Motorola StarTAC in 1996.

Nokia

Nokia made significant contributions to the mobile telephony industry, assisting in the development of the GSM, 3G, and LTE standards. For a decade beginning in 1998, Nokia was the largest worldwide vendor of mobile phones and smartphones. In the later 2000s, however, Nokia suffered from a series of poor management decisions, and soon saw its share of the mobile phone market drop sharply.

Nokia 5110 is a GSM mobile phone that was introduced in 1998.

Nokia 3210 is a GSM cellular phone, announced by Nokia in 1999.

Nokia introduced its “Connecting People” advertising slogan in 1992.

Oppo

Oppo phones are smartphones produced by the partially state-owned Chinese company Oppo.

The current lineup of phones includes the Find X, N, and Reno series.

Samsung

The Samsung Galaxy was released in 2009. It uses the Android operating system.

The Galaxy S was released in 2010. It is produced in over two dozen variations, and 25 million units were sold by 2013.

Samsung later expanded the Galaxy S line to tablet computers with the announcement of the Galaxy Tab S in 2014.

In 2012, Samsung Electronics became the world's largest mobile phone maker by unit sales, overtaking Nokia. The Galaxy accounts for around 19% of global smartphone market share today.

In 2017, Samsung announced the voice-powered digital assistant named "Bixby". It was introduced alongside the Samsung Galaxy S8.

Samsung announced the Samsung Galaxy S23 series, consisting of the Samsung Galaxy S23, Samsung Galaxy S23+ and Samsung Galaxy S23 Ultra, in February 2023.

Sony

The Sony Xperia X1 was the first smartphone to be released by Sony, in 2008.

Sony Mobile was previously known globally as Sony Ericsson before being rebranded in 2012.

The X10 was released in 2010. It was the first in the Xperia line to feature the Android operating system, where previous models ran on the Windows Mobile OS.

In 2017, Sony Mobile held less than 1% global market share.

Xiaomi

Xiaomi released its first smartphone in 2011. Most of the phones run on the MIUI User interface, which is based on the Android operating system.

Xiaomi's flagship mobile handset line is the Xiaomi series (formerly known as Mi series).

List of Android versions

Version Internal codename Release date
Android 1.0 2008
Android Cupcake Cupcake 2009
Android Donut Donut 2009
Android Eclair Eclair 2009
Android Froyo Froyo 2010
Android Gingerbread Gingerbread 2010
Android Honeycomb Honeycomb 2011
Android Ice Cream Sandwich Ice Cream Sandwich 2011
Android Jelly Bean Jelly Bean 2012
Android KitKat Key Lime Pie 2013
Android Lollipop Lemon Meringue Pie 2014
Android Marshmallow Macadamia Nut Cookie 2015
Android Nougat New York Cheesecake 2016
Android Oreo Oatmeal Cookie 2017
Android Pie Pistachio Ice Cream 2018
Android 10 Quince Tart 2019
Android 11 Red Velvet Cake 2020
Android 12 Show Cone 2021
Android 13 Tiramisu 2022
Android 14 Upside Down Cake Q3 2023
Android 15 Vanilla Ice Cream 2024

Mobile Network Operators

O2 was formed in 1985 as Cellnet and was later rebranded as BT Cellnet. O2 was bought by Telefonica in 2005 for £18 billion, but retained its name and continued to be based in the United Kingdom.

Orange S. A. was created when Hutchison Whampoa acquired a controlling stake in Microtel Communications Ltd during the early-1990s and rebranded it Orange. It became a subsidiary of Mannesmann in 1999 and was acquired by France Telecom in 2000. The France Telecom company was rebranded to Orange in 2013.

T-Mobile was launched as Mercury One2One (stylised one2one) in 1993. one2one was purchased by Deutsche Telekom in 1999. In 2010, it merged with Orange UK to form a joint venture, Everything Everywhere, which continued to operate the T-Mobile and Orange brands until 2015.

Virgin Mobile is owned by Virgin Media which is part of Virgin Media O2. was launched in 1999 as a private joint venture between One2One (later T-Mobile UK) and the Virgin Group. Virgin Media O2 is the biggest mobile network in the UK with around 24 million mobile customers.

Three UK (officially Hutchison 3G UK Limited) launched as the UK's first commercial video mobile network on 3 March 2003 (03-03-03), the day that 3G services went live across the country. In June 2023 it was announced that Three UK and Vodafone were planning to merge their UK-based operations.

EE is a brand within the BT Group. EE is the largest mobile network operator in the United Kingdom, with 32 million customers as of June 2023. The company was formed as Everything Everywhere in 2010 as a joint venture between Deutsche Telekom and France Telecom (now Orange S.A.). In 2012 it was rebranded to EE concurrently while launching the UK's first 4G mobile network.

Vodafone was originally part of Racal Electronics. The company was formed in 1985 and is headquartered in Newbury, Berkshire. The company owns and operates networks in 21 countries, with partner networks in 48 further countries.

Largest terrestrial mobile phone network operators

Company Country Subscriptions (in millions)
China Mobile China 974
Bharti Airtel India 496
Jio India 436
China Telecom China 390
China Unicom China 320
America Movil Mexico 307
MTN Group South Africa 289
Telefonica Spain 277
Vodafone United Kingdom 274
Orange France 241

Older Technology

iPod

iPod is a line of portable media players. The first version was released in 2001 and the product line was discontinued in 2022. Sales of iPods peaked in 2008. Apple sold an estimated 450 million iPod products

iPod product lines –

iPod (classic) – the original full-sized iPod line, marketed from 2001 to 2014, and retroactively named "classic" in 2007

iPod mini – a smaller version, marketed from 2004 to 2005

iPod nano – an even smaller version, marketed from 2005 to 2017

iPod shuffle – a series of tiny screen-less versions, marketed from 2005 to 2017

iPod touch – a series of iOS-based versions, marketed from 2007 to 2022

Compact disc

The compact disc was co-produced by Philips and Sony and released in 1982. By 2007, 200 billion CDs had been sold worldwide.

Standard CDs have a diameter of 120 mm (4.7 in) and are designed to hold up to 74 minutes of uncompressed stereo digital audio or about 650 MB of data.

CD formats –

CD-ROM – Read-only memory

CD-R – Recordable. Can be written once and read arbitrarily many times.

CD-RW – Rewritable. Can be written, read, erased, and re-written

The standard plastic case used by most manufacturers is known as a jewel case.

DVD

The DVD (Digital Video Disc or Digital Versatile Disc) is an optical disc. It was invented in Japan and released in 1996.

A standard DVD can store up to 4.7 GB of data.

Blank recordable DVD discs (DVD-R and DVD+R) can be recorded once using a DVD recorder and then function as a DVD-ROM. Rewritable DVDs (DVD-RW, DVD+RW, and DVD-RAM) can be recorded and erased many times.

Since 2008, DVD sales have declined more than 86%, due to a rise in customers buying on-demand and digital copies of films and the launch of streaming services.

The high-definition optical disc format war was between the Blu-ray Disc and Toshiba HD DVD optical disc standards for storing high-definition video and audio; it took place between 2006 and 2008 and was won by Blu-ray Disc.

Blu-ray Disc refers to the blue laser used to read the disc, which allows information to be stored at a greater density than is possible with the longer-wavelength red laser used for DVDs.

A standard Blu-ray Disc can store up to 25 GB of data. High-definition (HD) video may be stored on Blu-ray Discs with up to 1920 × 1080 pixel resolution.

Video recorder

The videocassette recorder, VCR, or video recorder, records analog audio and analog video from broadcast television or other source on a removable, magnetic tape videocassette.

Ampex introduced the Quadruplex videotape professional broadcast standard format with its Ampex VRX-1000 in 1956. It became the world's first commercially successful videotape recorder

In 1959 Toshiba announced a new method of recording known as helical scan, first implemented in reel-to-reel videotape recorders (VTRs).

The Telcan, produced by the UK Nottingham Electronic Valve Company in 1963, was the first home video recorder.

The Sony model CV-2000, first marketed in 1965, was their first VTR intended for home use.

In the 1970s, JVC’s VHS (Video Home System) won the ‘Videotape format war’ against Sony’s Betamax and Philip’s V2000. While Betamax was believed to be the superior format in the minds of the public and press (due to excellent marketing by Sony), consumers wanted an affordable VCR (which often cost hundreds of dollars less than a Betamax player).

DVD rentals in the United States first exceeded those of VHS in 2003.

The last VHS recorders were manufactured in 2016.

Cassette tape

The cassette tape was invented by Lou Ottens at Philips in 1963. Compact Cassettes come in two forms, either containing content as a prerecorded cassette (Musicassette), or as a fully recordable "blank" cassette.

Tape length usually is measured in minutes of total playing time. The most popular varieties of blank tape were C60 (30 minutes per side), C90 (45 minutes per side) and C120 (60 minutes per side).

Sales of CDs overtook those of prerecorded cassettes in the early 1990s. Sales of pre-recorded music cassettes in the US dropped from 442 million in 1990 to 274,000 by 2007.

Cassette tapes have seen a modest resurgence, and in the UK, sales of cassette tapes in 2021 reached its highest number since 2003.

Personal stereo

A personal stereo is also known as a personal cassette player.

The Sony Walkman was released in 1979. It became a popular and widely imitated consumer item in the 1980s. 220 million cassette-type Walkman were sold by the end of production in 2010.

Portable CD player

Discman was Sony's brand name for portable CD players. The first Discman, the D-50/D-5, was launched in 1984, two years after mass production of CDs began. The brand name was later changed to CD Walkman. Production ceased in 2008.

Electronics

History

Vacuum tubes (thermionic valves) were the first active electronic components which controlled current flow by influencing the flow of individual electrons.

The simplest vacuum tube, the diode, was invented in 1904 by John Ambrose Fleming. Electrons can flow in only one direction through the device – from the cathode to the anode.

The triode, which consists of three electrodes inside an evacuated glass envelope: a heated filament or cathode, a grid, and a plate (anode), was the first practical electronic amplifier. Invented in 1906 by Lee De Forest.

William Shockley of Bell Labs invented the first transistor in 1947.

The MOSFET (metal-oxide-semiconductor field-effect transistor) was invented at Bell Labs in 1959. The MOSFET was the first truly compact transistor that could be miniaturised and mass-produced for a wide range of uses.

Jack Kilby and Robert Noyce created the first integrated circuit in 1958.

Very large-scale integration (VLSI) is the process of creating an integrated circuit (IC) by combining millions or billions of MOS transistors onto a single chip. VLSI began in the late 1970s.

Electronic components

Circuit Symbols for A-level-OCR-Physics A.png

Components can be classified as active or passive. Active components can control the flow of current, amplify power, and require an external source of energy. Passive components cannot control the current, have no power gain, and do not need an external source of energy.

Active components

Transistor – a semiconductor device used to amplify and switch electronic signals. The two types of transistors are the bipolar junction transistor (BJT) and the field-effect transistor (FET).

Thyristor – a four-layered semiconductor rectifier in which the flow of current between two electrodes is triggered by a signal at a third electrode.

Diode – a vacuum tube that allows current to flow in one direction only.

Light-emitting diode (LED) – a semiconductor diode that converts applied voltage to light.

Photodiode – a semiconductor capable of converting light into either current or voltage.

Triode – an electronic amplifying vacuum tube.

Passive components

Resistor – an electronic component that restricts the flow of current in an electrical or electronic circuit.

Rheostat – a variable resistor that controls the flow of electric current by changing the resistance.

Potentiometer – a three-terminal resistor with a sliding or rotating contact that forms an adjustable voltage divider.

Thermistor – an electrical resistor whose resistance is greatly reduced by heating.

Memristor – an electrical component that limits or regulates the flow of electrical current in a circuit and remembers the amount of charge that has previously flowed through it.

Capacitor – formerly known as a condenser, is a device that stores electrical energy in an electric field by accumulating electric charges on two closely spaced surfaces that are insulated from each other.

Inductor – an electrical component that stores energy in a magnetic field when electric current flows through it.

A flip-flop or latch is a circuit that has two stable states and can be used to store state information.

Semiconductors

A semiconductor is a substance such as silicon or germanium whose electrical conductivity is intermediate between that of a conductor and an insulator. Its resistivity falls as its temperature rises

In semiconductor production, doping is the process of intentionally introducing impurities into an extremely pure (also referred to as intrinsic) semiconductor to change its electrical properties. The impurities are dependent upon the type of semiconductor. Lightly and moderately doped semiconductors are referred to as extrinsic. A semiconductor doped to such high levels that it acts more like a conductor than a semiconductor is referred to as degenerate.

n-type semiconductor – a semiconductor in which electrical conduction is due chiefly to the movement of electrons.

p-type semiconductor – a semiconductor in which electrical conduction is due chiefly to the movement of positive holes.

Semiconductor device fabrication is the process used to manufacture semiconductor devices, typically integrated circuits. Electronic circuits are gradually created on a wafer, typically made of pure single-crystal semiconducting material. Silicon is almost always used.

Integrated Circuits

An integrated circuit (chip, or microchip) is a set of electronic circuits on one small plate (‘chip’) of semiconductor material, normally silicon. Large numbers of miniaturized transistors and other electronic components are integrated together on the chip.

Generations of integrated circuits

Name Year Transistor count Number of logic gates
Small-scale integration (SSI) 1964 1 to 10 1 to 12
Medium-scale integration (MSI) 1968 10 to 500 13 to 99
Large-scale integration (LSI) 1971 500 to 20,000 100 to 9,999
Very large-scale integration (VLSI) 1980 20,000 to 1,000,000 10,000 to 99,999

VLSI was made practical by technological advancements in semiconductor device fabrication.

Ultra large-scale integration (ULSI) was proposed for chips of more than 1 million transistors.

Moore’s Law states that “the number of transistors that can be placed inexpensively on an integrated circuit doubles approximately every two years”. The law is named after Intel co-founder Gordon E. Moore, who described the trend in his 1965.

An application-specific integrated circuit (ASIC) is an integrated circuit chip customized for a particular use, rather than intended for general-purpose use.

A gate array is an approach to the design and manufacture ASICs using a prefabricated chip with components that are later interconnected into logic devices.

Manufacturers

Foxconn, based in Taiwan, is the world's largest maker of electronic components. Up to the iPhone 4, all iPhones and other Apple devices, such as iPod Touch models and iPads, were manufactured by Foxconn.

Taiwan Semiconductor Manufacturing Company (TSMC) is the world's most valuable semiconductor company. The company was founded in Taiwan in 1987 by Morris Chang. In 1997 it became the first Taiwanese company to be listed on the New York Stock Exchange.

Logic Gates

A logic gate is a device implementing a Boolean function; that is, it performs a logical operation on one or more logical inputs, and produces a single logical output. The primary way of building logic gates uses diodes or transistors acting as electronic switches. Today, most logic gates are made from MOSFETs.

Summary-of-the-common-Boolean-logic-gates-with-symbols-and-truth-tables.png

The NOT gate is more commonly called an inverter. The circle on the symbol is called a bubble and is used in logic diagrams to indicate a logic negation.

The output of the exclusive-OR (XOR) gate is true only when the two input values are different.

The XNOR is the logical complement of the XOR gate.

All Boolean logic gates can be created from a suitable network of NAND gates or NOR gates.

Microprocessors may contain more than 100 million logic gates.

Big Tech

Big Tech, also known as the Tech Giants, refers to the most dominant companies in the information technology industry. The term when referring to American technology companies notably the five largest from the United States: Alphabet (Google), Amazon, Apple, Meta (Facebook), and Microsoft.

Alphabet (Google)

Google was founded in 1998 by Larry Page and Sergey Brin while they were Ph.D. students at Stanford University.

The Google HQ in Mountain View, California, is known as the Googleplex.

Eric Schmidt served as the CEO of Google from 2001 to 2011 and the company's executive chairman from 2011 to 2015.

Sundar Pichai is the CEO of Alphabet and Google.

In 2006, Google acquired YouTube for $1.65 billion in Google stock.

Waze provides satellite navigation software on smartphones and other computers that support the Global Positioning System (GPS). The company was acquired by Google in 2013.

In 2015, Google announced plans to reorganize its various interests as a conglomerate named Alphabet Inc. Google became Alphabet's largest subsidiary and the umbrella company for Alphabet's Internet interests.

Google Ads (previously known as Google AdWords) is an online advertising platform developed by Google, where advertisers bid to display brief advertisements, service offerings, product listings, and videos to web users. Google Ads is the main source of revenue for Alphabet.

Google Drive is a file storage and synchronization service created by Google. It allows users to store files in the cloud, share files, and edit documents, spreadsheets, and presentations with collaborators.

Google Cloud Platform is a suite of cloud computing services.

Google Earth is a virtual globe program that was originally called Earth Viewer and was created by Keyhole, Inc. It maps the earth by the superimposition of images obtained from satellite imagery, aerial photography and GIS over a 3D globe.

Google Maps is a web mapping platform and consumer application. It offers satellite imagery, aerial photography, street maps, 360° interactive panoramic views of streets (Street View), real-time traffic conditions, and route planning for traveling by foot, car, bike, and public transportation. As of 2020, Google Maps was being used by over one billion people every month around the world.

Waymo is Google’s self-driving car project. The company was founded in 2009.

Google Glass was a brand of smart glasses. Google started selling a prototype of Google Glass in 2013, before it became available to the public in 2014.The headset received a great deal of criticism amid concerns that its use could violate existing privacy laws, and in 2015 Google announced that it would stop producing the Google Glass prototype.

Google TV was a smart TV operating system from Google co-developed by Intel, Sony and Logitech. It launched in 2010 and was succeeded in 2014 by Android TV.

Daydream is a discontinued virtual reality (VR) platform which was developed by Google, primarily for use with a headset into which a smartphone is inserted. Google is discontinued Daydream in 2019, due to a lack of interest from both consumers and developers.

Ruth Kedar designed the Google logo.

Amazon

Amazon was founded by Jeff Bezos from his garage in Bellevue, Washington, in 1994.

The first book sold on amazon.com was Douglas Hofstadter’s Fluid Concepts and Creative Analogies: Computer Models of the Fundamental Mechanisms of Thought

Amazon went public in 1997. It began selling music and videos in 1998.

Amazon opened a physical Amazon Books store in University Village in Seattle in 2015.

Amazon Web Services (AWS) was launched in 2002.

Andy Jassy replaced Jeff Bezos as CEO in 2021.

IMDB was purchased by Amazon in 1998.

Audible is an American online audiobook and podcast service that allows users to purchase and stream audiobooks and other forms of spoken word content. It was purchased by Amazon in 2008.

Goodreads was purchased by Amazon in 2013.

Twitch was purchased by Amazon in 2014.

Amazon Prime is a paid subscription service that gives users access to additional services otherwise unavailable or available at a premium to other Amazon customers. Services include same, one- or two-day delivery of goods, and streaming music and video

Amazon Music is a music streaming platform and online music store.

Amazon Kindle is a series of e-readers designed and marketed by Amazon. Launched in 2007.

Amazon Alexa is a virtual assistant, first used in the Amazon Echo smart speaker and the Echo Dot.

Amazon Fresh is a grocery retailer with physical stores and delivery services in most major U.S. cities.

Apple

Apple was founded by Steve Jobs, Steve Wozniak, and Ronald Wayne in 1976, to develop and sell personal computers. It was incorporated as Apple Computer, Inc. in 1977, and was renamed as Apple Inc. in 2007, to reflect its shifted focus towards consumer electronics.

Ronald Wayne left after 12 days and relinquished his (10%) share of the partnership back to Jobs and Wozniak for $800.

John Sculley was CEO of Apple from 1983 to 1993.

Tim Cook has been CEO of Apple since 2011.

Apple Park is the corporate headquarters of Apple, located in Cupertino, California. The main building's scale and circular design, by Norman Foster, have earned the structure the media nickname "the spaceship". Opened in 2017.

Jony Ive was the chief design officer of Apple from 1997 until 2019. He played a vital role in the designs of the iMac, iPod, iPhone, iPad, and MacBook.

The Apple I went on sale in July 1976 and was market-priced at $666.66

Apple Lisa was released in 1983. It is one of the first personal computers to present a graphical user interface (GUI) in a machine aimed at individual business users. Only 10,000 were sold in two years and it was considered a commercial failure.

Apple Mac was introduced by Steve Jobs in 1984. Its debut was signified by “1984”, a $1.5 million television commercial modeled after the George Orwell novel and directed by Ridley Scott, that aired during the 1984 Super Bowl.

NeXT was founded in 1985 by Steve Jobs after he was fired from Apple the same year. NeXT introduced the first NeXT Computer in 1988. Apple purchased NeXT in 1996.

iMac was a range of all-in-one Macintosh desktop computers built by Apple. It was sold from 1998 to 2003. iMac was the first PC sold without a floppy drive.

Newton platform was an early personal digital assistant and the first tablet platform developed by Apple, the second platform being iOS, used in the iPhone, iPod Touch and iPad. Development of the Newton platform started in 1987 and ended in 1998.

Apple introduced the iBook, a laptop aimed at the consumer and education markets, in 1999. Apple replaced the iBook line with the MacBook in 2006 during the Mac transition to Intel processors.

The first Apple Store retail locations were opened in the US in 2001.

iTunes Store was introduced in 2003. The service offered music downloads for 99 cents a song and integration with the iPod. The iTunes Store quickly became the market leader in online music services, and by 2010 was the world's largest music retailer.

In 2008, Apple launched the App Store to sell third-party applications for the iPhone and iPod Touch.

Beats Music was acquired by Apple as part of its purchase of Beats Electronics in May 2014. Beats Music stopped accepting new subscriptions when Apple Music launched in June 2015.

Apple bought Shazam in 2018.

FaceTime works by using an Apple device’s mobile data or Wi-Fi connection to make voice and/or video calls to other Apple device users.

Retina Display is a brand name used by Apple for liquid crystal displays which they claim have a high enough pixel density that the human eye is unable to notice pixelation at a typical viewing distance.

Apple Watch is a line of smartwatches that incorporates fitness tracking, health-oriented capabilities, and wireless telecommunication, and integrates with iOS and other Apple products and services. An estimated 100 million units had been sold by 2020

AirPods are wireless Bluetooth earbuds first announced in 2016.

The Apple logo was created by Rob Janoff.

"There's an app for that" which was first used in a commercial for the iPhone, is a slogan that has been officially trademarked by Apple.

Meta (Facebook)

Facebook was founded in 2004 by Mark Zuckerberg and some fellow Harvard College students. Its predecessor was a website called Facemash, and it was originally known as Thefacebook. Initially this was only opened to people with a Harvard email address.

Zuckerberg had previously worked on a similar project with fellow students Cameron Winklevoss, Tyler Winklevoss, and Divya Narendra. He eventually quit to do Thefacebook, but his ex-collaborators say he stole their concept and ideas and they wanted recompense. They eventually came to a settlement in 2008, with each of the trio receiving 1.2m shares in Facebook.

The company announced 500 million users in July 2010.

Facebook acquired Instagram in 2012 for approximately US$1 billion in cash and stock.

Facebook's initial public offering came in 2012, at a share price of $38. The company was valued at $104 billion.

Facebook acquired Oculus, a VR headset startup, in 2014. The Oculus Rift was the first virtual reality headset to provide a realistic experience at an accessible price.

WhatsApp was acquired by Facebook in 2014 for approximately US$19.3 billion

Sheryl Sandberg was chief operating officer of Facebook from 2008 to 2022.

In October 2021, Facebook rebranded itself as Meta Platforms, Inc., or simply "Meta" in an attempt to own the Metaverse, a concept for a 3D version of the internet. This change does not affect the name of the Facebook social networking service itself, instead being like the creation of Alphabet as Google's parent company in 2015.

For information on the Facebook website see Lifestyle/Social Media and the Internet

Microsoft

Microsoft was founded in 1975 in Albuquerque by Bill Gates and Paul Allen. Microsoft is a portmanteau of “microcomputer software”. The company headquarters are in Redmond, Washington.

Steve Ballmer replaced Bill Gates as CEO in 2000, and in 2014 Satya Nadella took over as CEO.

In April 2019, Microsoft became the third US public company to be valued at over $1 trillion after Apple and Amazon.

Microsoft was the world's largest software maker by revenue as of 2022.

Microsoft bought Skype Technologies for $8.5 billion in 2011.

Microsoft bought LinkedIn for $26 billion in 2016.

GitHub is a platform and cloud-based service for software development and version control using Git. It has been a subsidiary of Microsoft since 2018.

Microsoft HoloLens is an augmented reality (AR)/mixed reality (MR) headset developed and manufactured by Microsoft.

Microsoft Azure is a suite of cloud computing services.

Visual Studio is an integrated development environment (IDE) from Microsoft. It is used to develop computer programs including websites, web apps, web services and mobile apps.

Microsoft Store is a digital platform for the purchase and download of apps, games, and software from Microsoft and its partners.

Encarta is a discontinued digital multimedia encyclopaedia published by Microsoft from 1993 to 2009.

Microsoft Mobile was a subsidiary of Microsoft involved in the development and manufacturing of mobile phones. It was established in 2014 following the acquisition of Nokia's Devices and Services division by Microsoft. The company sold the Lumia range of phones, but in 2016 Microsoft abandoned its mobile business.

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