Definition of Operating System

Ok guys, I will discuss about the definition of Operating System. For those who have a PC or laptop operating systems are required to know about ... (hehe).
Operating system is a computer software that regulates and controls the basic operation of a computer system.
Int jam, the task of the operating system itself is:

1.  Perform file system management functions
2. Controlling a variety of sources on the system, such as printers and disk
3. Forming scheduling processes within the system
4. Set the number of concurrent users that the system