Any computer application program that is so useful that it alone justifies the purchase of the computer system, for which it was designed, as well as any peripheral or collateral software or hardware. For example, for the original Apple II personal computer, the "killer application" was Visi-Calc, the first spreadsheet program. In the case of the original IBM PC, the "killer application" was a wordprocessing program. For the Apple Macintosh, the "killer application" was graphics and desktop publishing. In all these cases (and many more), a single application was the impetus for sales of a system. Also colloquially referred to as a killer app.
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