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Also known as a sound
board or an audio card, a sound card is an expansion
card or integrated circuit that
provides a computer with the ability to produce sound that can be
heard by the user either over speakers and/or headphones. Below is an image of the
Creative Sound Blaster X-Fi
Xtreme Audio sound card and an example of what a sound card may look
like.
  To the right is an example of what a generic sound card may look like from the back of your computer and the connector symbols usually found next to each of the connections. With almost every sound card you'll have four connections: sound out or line out, sound in or line in, Microphone, and MIDI (Joystick).
You may also find that these ports are color coded as seen in the above picture of a computer sound card. If you're using speakers or other audio peripherals that are also color coded you can easily identify what port to use by matching the colors.
Below is a listing of some of the functions of a computer sound card.
Games
Audio CDs
Watch movies
Audio conferencing
Creating and playing Midi
Educational software
Business presentations
Record dictations
Voice recognition
Also see: Connection, Output device, Line in, Line out, MIDI, Sound, Speakers,
Sound definitions
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