The primary difference between UNIX and Linux is that UNIX is an operating system developed by AT&T Bell Labs in 1969, while Linux is a free open-source operating system developed by Linus Torvalds in 1991.
For example, UNIX was originally developed to be used on mainframe computers, while Linux was developed to be used on personal computers. UNIX also has a more complex file system structure than Linux, which is simpler and more intuitive.