Computer need a series of instruction to become useful . Software is one or more program t5hat actually makes the computer ‘s hardware “tick” . The software can be divided into two kinds :

(a) System software used to manage the operation of machine. a program that may allow you to create and manage data of railway enquiry/ resevation system or airline bookinh , etc.

SYSTEM SOFTWARE

A computer system may contains one or more processors, main memory , input and devices, clocks, terminal, etc To keep track of all these in not an easy job and operating system does exactly that.

The operating system

an operting system is an integrated set specialized programs that’s used to manage the resources and overall operations of a computer. The OS premit the computer to suoervise its own operations by automatically calling in th application programs, translating any other special service program, and managing the data needed to produse the output desire by users. The OS tends to isolate the hardware from the user. The user communicate with the OS, supplies instructions and input data that are acceptable fromat to the OS.

The computer system runing under OS control today rane in size from small personal compters to the large mainframe and supercomputer . The general goal of OS is to operate a computer with aminimum of idle time in t5he most efficient and economical ways during the execution of user programs.

There are number in Os fond in system of all size today. Most of these OS elements can be classifiedare either control or processing programs.