Sound cards allow you to connect a musical instrument, such as an electronic keyboard, to a computer to use the computer to compose music. You can also use a sound card and voice recognition software to be able to use your voice to instruct a computer to perform tasks. Sound cards also allow you to talk to friends, family members and colleagues over the Internet.

Sound cards allow you to record music from music CDs as well as use a microphone to record your own voice or sound effects. You can add the sounds you record to documents, presentations and home movies you create.