EXTENSION CARDS

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An extension card is an electronic card/board that is used to add extra functionality to a computer. It is in
serted into an expansion shot on the motherboard of a computer.
Expansion card contain edge connectors that are used to create an electronic link between motherboard and card, thus enabling these two to communicate.
  Many different classes of expansion card are available, including sound cards, video graphics card, network cards, and so on. All expansion cards are used to enhance the quality of their specific function. For example, video graphics cards are used to enhance the video quality on a computer.

  Expansion cards are also known as add-on cards or interface cards.

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