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In PCs, the Motherboard is the central printed circut board. The diagram below shows the parts of it.
800px-Acer E360 Socket 939 motherboard by Foxconn.svg

The motherboard of a PC.

It holds many of the crucial components of the system, providing connectors for other peripherals. The motherboard is sometimes alternatively known as the mainboard, system board, planar board or, on Apple computers, the logic board.