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A motherboard is a computer’s main circuit board, and it includes the following attached to a fixed planar surface:
Additionally, daughterboards and mezzanine cards, installed on a second level, may be plugged into the motherboard. A daughterboard may be the actual motherboard and/or card or board plugged into the motherboard.
The motherboard is also referred to as the main board (mobo), system board or planar board. Apple computers refer to the motherboard as the logic board.
The Advanced Technology (AT) motherboard is the most common and is based on the IBM AT motherboard - a design improved with the Advanced Technology Extended (ATX) specification.
Components such as external storage, video display, sound controllers and peripheral devices may be attached to the motherboard. However, these components are increasingly integrated into the motherboard. For example, disk controllers, graphics controllers supporting 2D/3D graphics and TV input, sound card output, fast Ethernet network controller, USB 2.0 controller (with up to 12 USB ports), an infrared data communication IrDA controller (for mobile phones and printers) and temperature, voltage, and fan-speed sensors all may be contained within the motherboard.