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Earlier discussion
1 older comment kept for context.
Oluwaseun Adeyemi
An operating system is the low-level software that supports a computer's basic functions, such as scheduling tasks and controlling peripherals.
Now, you can run a PC without the Operating System, but your computer would stop working because Windows is the operating system, the software that makes it tick and provides a platform for programs, like your web browser, to run on. Without an operating system, your computer system is just a box of bits that do not know how to communicate with one another, or with you.