What are they?
The motherboard serves to connect all of the parts of a computer together. The CPU, MEMORY, HARD DRIVES, OPTICAL DRIVES, VIDEO CARDS, SOUND CARD , these all connect to the motherboard directly or with cables.
About the Motherboard
The front of the Motherboard is for internal components to connect to the Motherboard, the MB is occasionally known as the back bone of the computer. The other part of the Motherboard is used to connect the Floppy and Hard Drive to the Motherboard.