The Sound card is a component that is responsible for the sound effects of a computer. It has several components that contribute to the production of sound on the speakers. The different functions of a sound card are:
Processing and synthesizing of sound Playing music from CDs, MP3s and DVDs
Recording audio from devices such as microphones
The sound card stores audio information in memory. It converts digital data from the PC to analog data that the sound devices use. It also converts analog data from audio devices to digital data that can be stored in memory. It uses a MIDI (Musical Instrument Digital Interface) for connecting to audio devices. We can connect speakers and a microphone of to the sound card. 
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