An app, short for application, is a software program designed to run on a computer or mobile device to perform a specific task or set of tasks. Apps are incredibly diverse, ranging from simple utilities like calculators and note-taking tools to complex programs like video games, social media platforms, and professional productivity suites. They are typically downloaded and installed from app stores like the Apple App Store or Google Play Store, and often provide a user-friendly interface tailored to the device they are running on. Apps have become an integral part of modern life, offering convenience, entertainment, and access to information at our fingertips.