what is app ?

 An app, short for application, is a software program designed to perform specific tasks on a computer, smartphone, tablet, or other electronic device. Examples of popular apps include Facebook, WhatsApp, Instagram, and Uber.

Apps can be downloaded from app stores such as the Apple App Store for iOS devices, Google Play Store for Android devices, or the Microsoft Store for Windows devices. They allow users to perform a variety of tasks, from social networking and gaming to productivity and navigation. Apps can be free or paid and often come with in-app purchases. The popularity of apps has led to the rise of the app economy, with many businesses now developing their own apps as a way to reach and engage with customers.