An app, short for application, is a software program designed to perform specific functions on a computer or mobile device. Apps can be downloaded and installed on smartphones, tablets, laptops, and desktop computers, and are typically designed to provide a specific set of features or functionality.

There are many different types of apps, including productivity apps, social networking apps, gaming apps, entertainment apps, educational apps, and more. Some apps are free to download and use, while others require a fee or subscription to access certain features or content.

Apps can be developed for a specific operating system, such as Android or iOS, or they can be developed as web apps that can be accessed through a web browser. Many apps are developed by independent developers or small companies, while others are developed by larger organizations, such as tech companies or media companies.

Overall, apps have become an integral part of modern digital life, providing users with a wide range of tools and services that can be accessed on the go, from anywhere in the world.