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Operating System: What & Why?

Without an Operating System (OS) a computer is useless or Every general purpose computer system must have an Operating System (OS), as we read these statement there are a couple queries popup in our mind i.e. what is an OS?, and why I need it?
Here I am going to clarify these queries in a nutshell.
What:
In simple terms, an operating system performs basic tasks such as recognizing input from the keyboard, sending output to the display screens, keeping track of files and directories on the disk, and controlling peripheral devices such as disk drives and printers.
Why:
Operating systems provide a software platform on top of which other programs, called application programs, can run. The application programs must be written to run on top of a particular operating system. Your choice of operating system, therefore, determines to a great extent the applications you can run. For PCs, the most popular operating systems are DOS, OS/2, and Windows.

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