What Is an Operating System? An operating system is a group of programs and functions that provide basic functionality on a computer. It is the software that manages access to a systems hardware and other resources. In simple terms, an operating system is a manager. It manages all the available resources on a computer. These resources can be the hard disk, a printer, or the monitor screen. Even memory is a resource that needs to be managed. Within an operating system are the management functions that determine who gets to read data from the hard disk, what file is going to be printed next, what characters appear on the screen, and how much memory a certain program gets. Once upon a time, there was no such thing as an operating system. The computers of forty years ago ran one program at a time. The computer programmer would load the program he (they were almost universally male at that time) had written and run it. If there was a mistake that caused the program to stop sooner than expected, the programmer had to start over. Because there were many other people waiting for their tur......

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