Linux is a powerful, open-source operating system based on the Linux kernel, first developed in 1991 by Linus Torvalds. Distributed under the GNU General Public License, Linux has evolved into one of the most versatile and secure operating systems, with countless distributions such as Ubuntu, Fedora, Debian, and Red Hat catering to different user needs. It is particularly dominant in server environments, powering the majority of web servers, supercomputers, and cloud infrastructure across AWS, Google Cloud, and Microsoft Azure. Its stability and efficiency make it a preferred choice for long-term, high-performance workloads. Linux supports multiple file systems such as ext4, Btrfs, and XFS, and comes with robust package managers for easy software installation and updates. Its strong security model, which includes SELinux and AppArmor, ensures hardened protection against cyber threats. While traditionally favored by developers and IT professionals, Linux has also expanded into consumer spaces through user-friendly distributions and gaming advancements like Proton and the Steam Deck. Completely free and open-source, Linux allows users to customize every aspect of their computing environment. With unmatched reliability, scalability, and community-driven innovation, Linux continues to be a cornerstone of enterprise IT, software development, cybersecurity, and personal computing.