Question

definition of operating system? why do we need an Operating System?

Answer 1

The software that supports basic functions of a computer is known as operating system. It manages all software and hardware of the computer. So if it is not present then our software and hardware will not function and without that we can not use our computer.

hope this helps you...
please Mark it as a brainliest answer...

Answer 2

an operating system is basically a system software  which controls the hardware n sftware n provides services for computer programs.there r 7 types of operating system:-
1 Single- and multi-tasking
2 Single- and multi-user
3 Distributed
4 Templated
5 Embedded
6 Real-time
7 Library
we need operating system because without an operating system, a computer cannot be of any important use as the computer's hardware will not be able to communicate with the software...os is the most important software  that runs on a computer.....os manages the computer's memory and processes...os help the user to commuicate with the computer without knowing how to speak the binaary language 
HOPE IT HELPS
PLZZ MARK AS BRAINLIST