Audio interfaces are used to transfer the audio coming from cables which come from microphones and a computer, and turn it into an electrical signal that can then be read by a computer. Also the reverse, audio interfaces send the audio into speakers so that we can hear it coming from a computer or the other inputs. Audio interfaces can vary by the amount of inputs that can be plugged into them. Certain variations will help the richness of the sound or have onboard effects such as like reverb or delays. DigitalDJGear.com offers the best quality audio interfaces at unbeatable prices.