A motherboard
(sometimes alternatively known as the mainboard,
system
board,
planar
board
or logic
board,
or colloquially, a mobo)
is the main printed circuit board (PCB) found in computers and other
expandable systems. It holds many of the crucial electronic
components of the system, such as the central processing unit (CPU)
and memory, and provides connectors for other peripherals. Unlike a
backplane, a motherboard contains significant sub-systems such as the
processor and other components.
Motherboard
specifically refers to a PCB with expansion capability and as the
name suggests, this board is the "mother" of all components
attached to it, which often include sound cards, video cards, network
cards, hard drives, or other forms of persistent storage; TV tuner
cards, cards providing extra USB or FireWire slots and a variety of
other custom components (the term mainboard
is applied to devices with a single board and no additional
expansions or capability, such as controlling boards in televisions,
washing machines and other embedded systems).
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