A motherboard is the central printed circuit board (PCB) in many modern computers and holds many of the crucial components of the system, providing connectors for other peripherals.
A video card, video adapter, graphics accelerator card, display adapter, or graphics card is an expansion card which generates output images to a display.
A sound card (also known as an audio card) is an internal computer expansion card that facilitates the input and output of audio signals to and from a computer under control of computer programs.
A hard disk drive (HDD; also hard drive or hard disk) is a non-volatile, random access digital magnetic data storage device.

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