Linux and Unix are operating systems that are alternatives to windows.
Unix was originally developed by phone companys in need of highly effecient computers. the history of Unix began before 1970. There are several versions of unix Free BSD, Solaris and HP-UX are some of them.

Linux is loosely based upon unix. linux and unix have many similaritys and there are also some diffrences.
there are many versions or distubutions of linux in diffrent languages and all parts of the world.
Linux is completly adaptable and can be configured to meet any preference you have.