English version

killer app

From Longman Dictionary of Contemporary Englishkiller appkiller app /ˈkɪlər æp/ (also killer application) noun [countable]  a piece of computer software that many want to buy, especially one that works so well on a particular machine that people want to buy itFrom Longman Business Dictionarykiller appˈkiller ˌapp (also killer ap) noun [singular]1COMPUTINGMARKETINGa very useful or exciting computer program that customers feel they must haveAn example of a killer app is the spreadsheet program.2COMPUTINGMARKETINGa feature of a product’s hardware or software which the manufacturer says is much better than anybody else’s, in an attempt to make people want to buy that product rather than any other one
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