What is Unix ?

Unix is multiuser,multitasking operating system developed at Berkley in 70's. Some of its salient features wer that it was multiuser so at any time more than one personn was able to use the system. It had good support for communiation between users of the network as well as seems to be alot portable.
Unix has layered architecture with hardware at the bottom. Above Hardware, there is kernel, than shell and than System applications. To know more about Unix and Unix history, Please do look at the recommended links