Meaning of “killer app” in the English Dictionary

(Definition of “killer app” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"killer app" in Business English

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killer appnoun [ C ]

uk us also killer ap, killer application IT

computer software that is very popular or useful, especially software that is the reason people buy certain computer systems, mobile phones, etc.:

Mobile access to social networking sites is the next killer app.

a use for a particular technology that becomes extremely popular and is the reason people want that technology:

At the time they thought that e-learning would be the killer app of the Internet.

(Definition of “killer app” from the Cambridge Business English Dictionary © Cambridge University Press)