An app (short for application) is a software program designed to perform specific tasks on devices like smartphones, tablets, and computers. Apps can be downloaded from online stores, such as the Apple App Store or Google Play Store, and they serve various purposes, including communication, entertainment, productivity, and education. Apps can be categorized into different types, such as mobile apps, which run on smartphones, and web apps, which operate through web browsers. They often provide users with convenient features and tools, enhancing their daily activities and experiences. Popular examples include social media apps like Facebook and productivity apps like Microsoft Office.