A sound card is an internal expansion card of the computer that will facilitate the output and input of audio signals from and to the computer under the computer program controls. The term could be applied to the interfaces of external audio that uses the programs of computer.
They soundcards are typically used for composing music, editing audio or video, making presentations, entertainment, Education programs and making video projections. Some of the functionalities of the sound card could be integrated to the motherboard of the computer using the component as simple as the plug in card. If the plug in card is of good quality the quality of sound achieved by the sound card will be much better. Most of the sound card converts digital signals to analog. A quality sound is a must for musicians and music composers these days. They are also very common among music enthusiasts.