What is the mother bored?

To answer your question it is a mother board. Notice the spelling. The firmware of the computer runs from the motherboard (firmware is important software needed to run hardware correctly). Generally referred to as a "Mobo" the motherboard runs everything your computer uses to run, it is essentially the heart of your computer. The graphics card, the power source, the Disk drives, and much more all depend on the motherboard to centralize and keep your computer running.