Linux is an open-source operating system kernel first released by Linus Torvalds in 1991. It forms the foundation of a vast ecosystem of operating systems — called distributions or distros — that power everything from web servers and supercomputers to smartphones and embedded devices. The Linux kernel itself is maintained by thousands of contributors worldwide and is one of the largest collaborative software projects in history.
For developers, Linux is the dominant server operating system. The vast majority of web servers, cloud instances, and containerized workloads run on Linux. Understanding how to navigate the command line, manage processes, configure services, and work with the file system is a foundational skill for backend developers, DevOps engineers, and anyone working with cloud infrastructure.
For server and cloud workloads, Linux is the default choice. AWS, Google Cloud, and Azure all run Linux on the vast majority of their infrastructure. When you deploy a Docker container or a serverless function, it almost certainly runs on Linux underneath. Understanding Linux system administration is therefore a prerequisite for serious backend or DevOps work.
For developers, running Linux locally (or via WSL on Windows) provides a development environment that closely matches production. This reduces the class of bugs that only appear in production due to OS differences, and gives access to the full ecosystem of Unix tools that are standard in professional development workflows.
Ubuntu and Debian are the most common server distributions. For desktop use, Ubuntu, Fedora, and Pop!_OS are popular starting points. WSL2 on Windows provides a full Linux environment without dual-booting. Most cloud providers offer Linux instances that can be provisioned in minutes.