Unix, often pronounced as UNIX is an operating system, developed at Bell Labs in the early 1970s as an interactive time-sharing machine. Ken Thompson, Dennis Ritchie, and others team members are the inventors of Unix. In 1976, Unix has become the first operating system based on C language.
It is a freeware product, with so many extensions and new ideas provided in a variety of versions of Unix. Created just a handy for developers, UNIX was designed to be small, flexible system used primarily by the system programmers.