Expansion Card – Alternatively referred to as an add-on card, , internal card, interface adapter, or card, it is a PCB that fits into an expansion slot on a desktop computer. The PC component is used to give a computer additional capabilities, such as enhanced video performance via a graphics card.

Types of expansion cards in a computer
Interface card (ATA, Bluetooth, EIDE, FireWire, IDE, parallel, RAID, SCSI, serial, and USB).
MIDI
Modem
MPEG decoder
Network card
Sound card
Tuner card
Video capture card
Video card

In computing, an expansion card (Also called adapter card or accessory card) is a printed circuit board that can be inserted into an electrical connector, or expansion slot (also referred to as a bus slot) on a computers motherboard, backplane or riser card to add functionality to a computer system.

This type of card allow the capacities and interfaces of a computer system to be adjusted to the tasks it will perform. For example, a high-speed multi-channel data acquisition system would be of no use to a personal computer used for bookkeeping, but might be a key part of a system used for industrial process control. Expansion cards can often be installed or removed in the field, allowing a degree of user customization for particular purposes. Some expansion cards take the form of “daughterboards” that plug into connectors on a supporting system board.

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