Linux, often referred to as GNU/Linux, is a free and open-source operating system. Developed by Linus Torvalds in 1991, Linux has become a popular choice for both desktop and server environments due to its stability, security, and flexibility.

One of the main advantages of Linux is its wide range of distributions, such as Ubuntu, Fedora, and Debian, which cater to different user needs. Linux distributions come with a variety of graphical user interfaces (GUIs) and software packages, making it versatile for different purposes.

Linux is known for its command-line interface, which allows users to interact with the system using text commands. This gives users greater control over the operating system and enables advanced customization options. Additionally, Linux supports a wide range of programming languages and tools, making it a popular choice among developers.

Another key feature of Linux is its security. Due to its open-source nature, vulnerabilities are typically quickly identified and patched by the community, making Linux more resistant to malware and other security threats.

Overall, Linux offers a powerful and reliable alternative to other operating systems, and its widespread use extends from personal computers to servers, supercomputers, embedded systems, and even mobile devices.