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.