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killer app

noun [C]
 
 
/ˌkɪl.əˈræp/ US  /-ɚˈæp/ (also killer application) informal

Definition

a computer program that is much better than all others of its typeComputer 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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