The most common way to hide the taskbar without extra software is the "Auto-hide" feature, which makes the bar disappear when the mouse is not hovering over it.
In Windows 8 and 8.1, you can hide the taskbar using built-in settings or specialized third-party software for more advanced control. Built-in "Auto-Hide" Method Hide Taskbar Windows 8 Software
: Under the "Taskbar" tab, check the box for Auto-hide the taskbar . Apply Settings : Click Apply and then OK . Specialized Software for Windows 8 The most common way to hide the taskbar
: If you are on the Start screen, click the Desktop tile. Hide Taskbar Windows 8 Software
: Allows you to hide the taskbar along with browser windows and desktop icons instantly to protect privacy. Advanced Control & Troubleshooting