Operating system :
An operating system is an integrated set of specialised programs that are used to manage over all resources of and operation of the computer. It is specialised software that controls and monitors the execution of all other programs that reside in the computer, including application programs and other system software.
NOTE :
An operating system is a program that acts as an interface between the user and the computer hardware and controls and manages the overall resources of computer system.
Objective of operating system :
1. Making a computer system convenient to use in an efficient manner.
The operating system hides the details of the hardware resources from the user and provides the user with a convenient interface for using the computer system. It acts as an intermediatory between the hardware and its users and making it easier for the user to access and use other resources.
The efficient operation of the computer system is particularly important for large, shared multiuser systems. These systems are very expensive, so it is desirable to make them as efficient as possible.
2. Managing the resources of a computer system.
This objective involves performing such tasks as keeping track of who is using which resource , granting resource requests, accounting for resources usage and mediating conflicting requests from different programs and users. The efficient and fair sharing of resources among users and/or programs is a key goal of most operating system.
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