killer app
noun [ C ] informal uk/ˌkɪl.ər ˈæp/ us/ˌkɪl.ɚ ˈæp/ (also killer application)
（大大优于其他类似产品的）杀手级应用程序;最优秀的电脑程序
a computer program that is much better than all others of its type
（变得极为流行的）技术应用
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. 许多软件公司和因特网提供商认为接下来电子学习将广为流行。