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English definition of “killer app”

killer app

noun [C]
 
 
(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)
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