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Operating system

Definition-
An operating system (OS) is a software, that manages the computer hardware, and provides common services for execution of various application software or in other words it works as an intermediator between the hardware and the Application software.

Functions of Operating System:
Allocate Resources
Monitor Activities
Manage disk and files

Types of Operating System :
Windows XP
Windows 95 and Windows 98
DOS
Windows Me
Windows NT
Windows CE
Unix
Linux
Apple MacIntosh