This is the central circuit board of a computer. It is sometimes called motherboard, mainboard, logic board etc. The commonest form factors in use in PCs are: AT, BTX but the ATX brought about many chances on a PC. The mainboard contains connectors for power supply unit, peripheral devices, additional boards (sound, graphic, NIC… cards). It also houses the CPU, memory, mass storage interfaces and the chipset. All these communicate with each other via the various buses.

It accommodates every other thing in a PC.

Motherboard

CPU

RAM

Graphic Card

Hard Disk Drive

Optical Mouse