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In marketing terminology, a killer application (commonly shortened to killer app) is any computer program that is so necessary or desirable that it proves the core value of some larger technology, such as computer hardware, video game console|gaming console]], software, a programming language, software platform, or an operating system. In other words, consumers would buy the (usually expensive) hardware just to run that application. A killer app can substantially increase sales of the platform on which it runs.〔 Early use of the term "Killer Application".〕〔 Early use of the term "Killer App".〕 ==Examples== One of the first examples of a killer application is generally agreed to be the VisiCalc spreadsheet for the Apple II series.〔D.J. Power, ''(A Brief History of Spreadsheets )'', DSSResources.COM, v3.6, 8 August 2004〕 Because it was not available on other computers for 12 months, people spent $100 for the software first, then $2000 to $10,000 on the Apple computer they needed to run it. ''BYTE'' wrote in 1980, "VisiCalc is the first program available on a microcomputer that has been responsible for sales of entire systems", while ''Creative Computing''s VisiCalc review was subtitled "reason enough for owning a computer". Others also chose to develop software, such as EasyWriter, for the Apple II first because of its higher sales, helping Apple defeat rivals Commodore International and Tandy Corporation. Lotus 1-2-3 similarly benefited sales of the IBM PC and compatibles, including to Apple owners. Noting that computer purchasers did not want PC compatibility as much as compatibility with certain PC software, ''InfoWorld'' suggested "let's tell it like it is. Let's not say 'PC compatible,' or even 'MS-DOS compatible.' Instead, let's say '1-2-3 compatible.'" Another killer app is WordStar, the most popular word processor during much of the 1980s. Once the Internet became more widely available to consumers, email was seen as a killer app that drove people to purchase computers, even though email is a genre of applications rather than a single "app." 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Killer application」の詳細全文を読む スポンサード リンク
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