If you open more than one program or document at a time, you can quickly start piling up windows on your desktop. Because windows often cover each other or take up the whole screen, it's sometimes hard to see what else is underneath or remember what you've already opened.
That's where the taskbar comes in handy. Whenever you open a program, folder, or document, Windows creates a button on the taskbar corresponding to that item. The button shows the icon and name of the item. In the picture below, two programs are open—Calculator and Minesweeper—and each has its own button on the taskbar.
|Each program has its own button on the taskbar|
Notice how the taskbar button for Minesweeper appears pressed in. That indicates that Minesweeper is the active window, meaning that it's in front of any other open windows and is ready for you to interact with.
To switch to another window, click its taskbar button. In our example, clicking the taskbar button for Calculator brings its window to the front: