UNIX is an Operating System which is widely used in Severs, Mainframe Computers and Mobile devices. It was first introduced in 1960 and has been under constant development ever since.
It was designed to let a number of programmers access the computer at the same time and share its resources.
The developers of UNIX Operating System were Dennis Ritchie and M.D. Mcllroy.
In the 1960s, the Massachusetts Institute of Technology, AT&T, Bell Labs, and General Electric developed an experimental operating system called Multics for the GE-645 mainframe. Multics introduced many innovations, but had many problems.
The features that made UNIX a hit from the start are:
Multitasking capability
Multi-user capability
Portability
UNIX programs
Library of application software.
The kernel, which schedules tasks and manages storage
The shell, which connects and interprets users' commands, calls programs from memory,and executes them.
The tools and applications, that offer additional functionality to the operating system 
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