An expansion card is a small circuit board. It gives a computer the capability to control a storage device, an input device or an output device. Basic purpose of an expansion card is to enhance the capability of the computer.
There are four major types of expansion cards.
Sound Card
A sound card allows a computer to receive sound in digital from and reproduce it through speakers.
Graphics Card
A graphics card enables a computer to display output images on the monitor screen.
Network Interface card
A network interface card enables a computer to connect and communicate with other computers.
Modem
Modem is used to transmit digital data over telephone wires. Usually it is used for dial-up Internet connections.
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