A Motherboard (also known the main board) is a printed circuit that holds and allows communication between CPU, RAM, Hard disk, and other internal peripherals.
In older days, numerous printed circuits were used along with copper wire for connection. But often maintaining the multiple boards grew very complex and expensive. So a PCB was developed to house all these in a single circuit board.
A motherboard has various slots for components to attach to it. The above image is a simple representation of the slots and the components of the motherboard. This gives an overview of how the motherboard looks like.
Troubleshooting your Motherboard
It is good that all the components of the computer are brought under a single PCB, but this also makes very difficult for troubleshooting your motherboard if it starts to malfunction.
Check Troubleshoot your Motherboard for step by step instructions on troubleshooting your computer motherboard.