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English definition of “killer app”

killer app

noun [C]     /ˌkɪl.əˈræp/ US  /-ɚˈæp/ (also killer application) informal
a computer program that is much better than all others of its type Computer programming and software a use for a particular technology that becomes extremely popular : Many software companies and internet providers believe that e-learning is the next killer app .Good and excellent thingsLiked, or not liked, by many people
(Definition of killer app noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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