killer app
noun/ˌkɪlər ˈæp/
/ˌkɪlər ˈæp/
(also killer application
(informal)/ˌkɪlər ˌæplɪˈkeɪʃn/
/ˌkɪlər ˌæplɪˈkeɪʃn/
)- a feature or function of a new technology or product that is so useful or popular that it becomes something that everyone or all similar products have to have
- The barcode is one of the killer apps of the digital economy.
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killer app