A motherboard (sometimes alternatively known as the mainboard, system board, baseboard, planar board or logic board, or colloquially, a mobo) is the main printed circuit board (PCB) found in general purpose microcomputers and other expandable systems.
It holds and allows communication between many of the crucial electronic components of a system, such as the central processing unit (CPU) and memory, and provides connectors for other peripherals.
A motherboard usually has a Keyboard Port, Mourse Port, Power Input Connector, CPU slot, RAM Slots, a Battery, IDE Connectors, Primary and Secondary Hard Drives, IDE Connector Floppy Drive, ISA slots, PCI slots, AGP slots and a Parallel Port .
Motherboard specifically refers to a PCB with expansion capability and as the name suggests, this board is often referred to as the "mother" of all components attached to it.