The task bar is a bar at the bottom of your computer screen that helps you easily access and manage open programs and apps. It displays small icons representing each open program, allowing you to switch between them quickly. Full definition
On a tablet screen there's actually room to make the bottom bar useful, so they added notifications and a small task bar to it. (gigaom.com)
Click this shortcut in task bar, and the full list of Metro Apps will open in Windows explorer. (thewindowsclub.com)
You can have a taskbar shown on only one display, a single taskbar stretched across all displays, and even an separate task bar for each display that only shows the apps open on that display. (howtogeek.com)