We are all familiar with the beeps, and the message that flashes past alerting you to press DEL, or F2, or some other key to access the BIOS settings. With the advent of Windows 8, though, the archaic BIOS will be on its way to the grave.
UEFI is a newer, more capable platform than the traditional BIOS. It has been around for awhile, and has seen limited use, but Windows 8 embraces UEFI and that is all that will be needed to push it into the mainstream.
Check out this article to learn what you should know about UEFI.