What does a computer operating system do?

Q: I need 3 ways of what a Computer OS does (preferably Windows) Thanks

A: OS does these things- 1) To interact with your hardware including processor, hard disk, DVD drive, sound & multimedia. 2) OS create an environment with various layers to handle hardware, programs, data & user's actions. 3) To create a "User Interface' so human can interact with this system. I think thats all.

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