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Chapter 3. Understanding Microsoft Windo... > What Windows Is—and What It Does

What Windows Is—and What It Does

Windows is a piece of software called an operating system. An operating system does what its name implies—it operates your computer system, working in the background every time you turn on your PC.

Equally important, Windows is what you see when you first turn on your computer, after everything turns on and boots up. The “desktop” that fills your screen is part of Windows, as is the taskbar at the bottom of the screen and the big menu that pops up when you click the Start button.


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