1.A sound card (also known as an audio card) is a computer expansion card that facilitates the input and output sound under control of computer programs.
2.A video card, (also referred to as a graphics accelerator card, display adapter, graphics card, and numerous other terms), is an item of personal computer hardware whose function is to generate and output images to a display.
3.A network card, network adapter or NIC (network interface card) is a piece of computer hardware designed to allow computers to communicate over a computer network.
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