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Defination of OS(operating system) and its concepts

  What do you mean by operating system?

   Definition: An operating system is a program that act as an interface between the user of a computer and the            

                         Computer hardware. Operating system is a first program that gets loaded into the memory through a process called booting.

Concepts of operating system:

·                     The purpose of operating system is to provide an environment in which a user can execute program in a convenient and efficient manner.

·                     Operating system is an integrated set of program that manages the various hardware resources such as processor, memory, I/O Devices , communication devices and overall operation of a computer system.

·                     Operating systems also acts as a platform on which various applications programs such as word processor and excel are executed.

·                     The most common operating system are the window family of operating system (windows 98, window 2000, Nt, Vista and window 7), UNIX and Macintosh operating system.

 

*             Operating system as an extended machine.

*             operating system as resource manager .

   Operating system as an extended machine:

§   An operating system is a layer of software on the top of the bare hardware of a computer system.

§   This operating system manages the all parts of  the system, and presents to the users with an interface or virtual machine ,that is easier to program and use.

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