Bus

A bus generally refers to an internal routing path within audio equipment. For example, busses are commonly used in mixing consoles or DAWs (Digital Audio Workstations) to route or combine audio tracks for mixing purposes.

Busses are also used for monitoring purposes. For example, an engineer can patch 24 channels of audio into a console and then bus them all to the stereo output (or stereo bus) where they will be combined into two channels and sent to a pair of speakers.