An audio interface is a hardware device that connects microphones, instruments, and other audio sources to a computer. It converts analog signals (like sound from a microphone or guitar) into digital audio that can be processed, recorded, or edited in software (like a digital audio workstation or DAW). It also converts digital audio from the computer back into analog form so it can be heard through headphones or speakers. In addition to analog-to-digital conversion, an audio interface often includes preamps, multiple input/output options, and phantom power for condenser mics.
