Linux is an open-source operating system modeled on UNIX. It was created by Linus Torvalds in 1991 and has since become one of the most popular operating systems in the world, especially for servers, embedded systems, and as a base for various distributions (commonly referred to as distros), such as Ubuntu, Fedora, and CentOS.
**Key Characteristics of Linux:**
- **Open Source:** The source code is freely available, allowing users to modify and