In the Windows 10 operating system, Task View is a button located on the Taskbar, to the right of the Windows Start Menu button. Clicking (or tapping) the icon will tile all open programs across the screen, like a set of index cards. This allows you to see all programs that are currently open and running. Each program, shown as a card does not overlap with another, making it easy to find a specific window or application. From the Task View window, you simply click any card to open the program full screen.
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Image: Windows 10 Task View tiles open programs like index cards on the screen.