Killer App

an application/service so valuable to its market that people will buy a bigger container-offering just to get it.

e.g. a computer software Killer App is a package that people will buy a computer just to use.

• the VisiCalc Spreadsheet is the classic case

book: UnleashingThe Killer App ISBN:1578512611

• Larry Downes & Chunka Mui define a "killer application" as "a new good or service that establishes an entirely new category and, by being first, dominates it, returning several hundred percent on the initial investment." Ptui.