App (noun)

A software application, typically a small, specialized program downloaded onto mobile devices.

Origin:

Short for application, 1980s.

Examples:

1. I downloaded a new app on my phone.
2. The app is available for both iOS and Android.
3. The app is used to track your daily exercise.
4. The app is designed to make your life easier.
5. The app is a must-have for every traveler.