Linux is an open-source operating system based on the Unix architecture. It is widely used for its stability, security, and flexibility, making it popular in servers, desktops, and embedded systems. Linux is highly customizable, allowing users to modify and distribute their own versions. It supports a wide range of software and is the foundation for many distributions like Ubuntu, CentOS, and Fedora. Its powerful command-line interface and extensive set of tools make it a preferred choice for developers, system administrators, and tech enthusiasts.