A motherboard (also known as mainboard, main circuit board, system board, baseboard, planar board, logic board, and mobo) is the key printed circuit board (PCB) in general-purpose computers and other expandable systems. It holds and allows communication between lots of the crucial electronic pieces of a system, including the central processing unit (CPU) and memory, and connectors for other peripherals. Unlike a backplane, a motherboard usually contains significant sub-systems, including the central processor, the chipset’s input/output and memory controllers, interface connectors, and other elements integrated for general use.
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Motherboard means especially a PCB with expansion capabilities. As the name suggests, this board can often be known as the “mother” of most parts mounted on it, which frequently include peripherals, interface cards, and daughtercards: sound cards, video cards, network cards, hard disks, and other varieties of persistent storage; TV tuner cards, cards providing extra USB or FireWire slots; and a number of other custom components.
Dell Precision T3600 System Motherboard , found in professional CAD Workstations. Stated in 2012
Similarly, the word mainboard describes a device with an individual board no additional expansions or capability, such as for example controlling boards in laser printers, tv set sets, washing machines, cell phones, and other embedded systems with limited expansion abilities.
The word Logic board is brand specific, coined by Apple in the first 1980’s for the motherboards in Macintosh computers.