An "app," short for application, is a software program designed to perform specific tasks on devices like smartphones, tablets, and computers. Apps can serve various purposes, such as communication, entertainment, productivity, and education. They are typically downloaded from online stores, such as the Apple App Store or Google Play Store. Apps can be categorized into different types, including mobile apps, which run on mobile devices, and web apps, which operate through web browsers. Many apps are free, while others may require a purchase or subscription. They enhance user experience by providing convenient access to services and information.