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An Operating System is a program that acts as an intermediary between a user of a computer and

the computer hardware, to ensure the correct operation of the computer. The Operating System

prevents user programs from interfering with the proper operation of the computer and provides

services to make programming easier. The Operating System is the one program running at all times,

controls the execution of user programs and manages and allocates resources. The primary goal of an

Operating System is convenience for the user, the secondary goal is efficient operation of the

computer system and the third goal is optimal use of computer resources.

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Q: What is an operating system and three main purpose?
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