A sound device is a device which generates tones, usually using MIDI technology.
Types of sound devices include computer sound cards and synthesizers.
In computers, sound cards serve to interpret audio signals for playback through speakers.
Sound devices can have varying levels of sound quality.
A sound device is essential to any computer with which you wish to play music or sound. Without a sound device, a computer cannot play audio files.
With a sound device, you can play recorded music from your computer, and on some sound devices you can make music of your own to play back.