Unix began in the late 1960s at Bell Labs as an experimental yet rapidly capable operating system focused on simplicity, portability, and efficiency. Today the term typically refers to systems certified under The Open Group’s Single UNIX Specification.
The Unix philosophy - “do one thing and do it well”, small tools that can be combined - has influenced countless systems that followed, including many that don’t carry the Unix name but are Unix-like.
If you work with servers, write system-level code, or want to understand where much of today’s operating systems originate, Unix is not just history but a living influence. Its design and concepts continue to appear in modern Unix derivatives, cloud infrastructure, and embedded systems.

