Master Bus
Definition
The final summing point in a mixing session where all audio channels combine before output. Processing applied to the master bus affects the entire mix simultaneously.
In Simple Terms
The final mixing point where all your tracks come together before leaving the DAW. Whatever you do here—EQ, compression, limiting—affects every sound in your entire mix at once.
In Practice
A transparent compressor and high-quality EQ on the master bus shape the overall tonal balance and cohesion of the final mix before the bounce.