Question

what is an operating system briefly explain any of two functions

Answer 1

An operating system is a set of programs that lies between applications software and the computer hardware. 

An operating system has SEVERAL functions:
(1) manage the computer's resources, such as the central processing unit, memory, disk drives, and printers
(2) establish a user interface,

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Answer 2

A computer program that organise a number other programs at the same time.
An operating system has three main functions: (1) manage the computer's resources, such as the central processing unit, memory, disk drives, and printers, (2) establish a user interface, and (3) execute and provide services for applications software