What is taskbar, how to use taskbar, and how to customize windows 8 taskbar etc everything is explaining here.
Windows 8 brings a whirlwind of options for the lowly taskbar, getting you play with it in more ways than a strand of spaghetti and a fork. And that's especially important in Windows 8: By stocking the taskbar with icons for oft-used programs, you can avoid unnecessary trips to the Start screen.
First, the taskbar comes preloaded with two icons on its far left: Internet Explorer (your full-featured web browser) and File Explorer (your file browser). Like all your taskbar icons, they're movable, so feel free to drag them to any order you want.
If you spot a favored program's icon on your Start screen, right-click the icon and choose Pin to Taskbar from the pop-up menu. You can drag and drop a desktop program's icon directly onto the taskbar, as well.
For even more customization, right-click a blank part of the taskbar and choose Properties. The Taskbar Properties dialog box appears.
The following explains the dialog box's options. (You need to remove the check mark by Lock the Taskbar before some of these options will work.)
Customize the Taskbar:
Lock the Taskbar: - Selecting this check box locks the taskbar in place, keeping you from changing its appearance. Keep it locked to protect from accidental changes, but lock the taskbar only after you've set it up to suit your needs.
Auto-Hide the Taskbar: - Handy mostly for small screens, this option makes the taskbar automatically hide itself when you're not near it. (Point your cursor at the screen's bottom edge to bring it back up.) Leave this option deselected to keep the taskbar always in view.
Use Small Taskbar Buttons: - Another helper for small screens, this shrinks the taskbar to half-height, letting you pack in a few extra tiny icons.
Taskbar Location on Screen: - Your taskbar can live on any edge of your desktop, not just the bottom. Choose any of the four edges here.
Taskbar Buttons: - When you open lots of windows and programs, Windows accommodates the crowd by grouping similar windows under one button: All open Microsoft Word documents stack atop one Microsoft Word button, for example. To protect the taskbar from overcrowding, select the option called Always Combine, Hide Labels.
Feel free to experiment with the taskbar until it looks right for you. After you've changed an option, see the changes immediately by clicking the Apply button. Don't like the change? Reverse your decision and click Apply to return to normal.
After you set up the taskbar just the way you want it, select the Lock the Taskbar check box.