In audio mixing, what best describes a stem?

• A. A submix that groups tracks
• B. A master file for distribution
• C. A single stereo file containing all channels
• D. A specialized audio plugin

Answer: (B)

Stems are separate, submixed groups of tracks that can be treated as independent mix units in a project. The description that best fits a stem is a master file for distribution, because a stem represents a self-contained mix of a subset of tracks that can be balanced, processed, and handed off or delivered for further work in the workflow. In practice, stems are exported as their own “master” files so different teams or stages can work with them without needing the entire full mix at once. The other options point to the final stereo mix or to a tool, rather than to the idea of a distribution-ready submix.