abbreviation for application: a computer program that is designed for a particular purpose
You can run an app on your PC that will find the files and burn them to a CD.你可以在电脑上启动一个应用程序，找到文档并拷贝成光盘。
（可下载到智能手机、平板电脑和其他移动装置上使用的）应用程序（application的缩写）
abbreviation for application: a computer program or piece of software designed for a particular purpose that you can download onto a mobile phone or other mobile device
There are apps for everything, from learning a language to booking cinema tickets.现在的应用程序应有尽有，从学习语言到购买电影票都可以做到。