Android is a mobile operating system developed by Google. It is based on the Linux kernel and is designed primarily for touchscreen mobile devices such as smartphones and tablets. Android is the most popular mobile operating system in the world, with over 2 billion active users. It offers a wide range of features and capabilities, including a customizable user interface, support for a variety of apps, and access to the Google Play Store for downloading additional content. Android is open source, which means that developers can modify and distribute the operating system freely.