An audio stem is an isolated sub‑mix of a track’s individual elements – such as drums, bass, vocals, or strings – exported as separate stereo files. Stems allow mixers, music editors, and supervisors to re-balance or mute specific parts without accessing the full multitrack session.
Delivering stems is standard in trailer, advertising, and streaming deliverables, giving post‑production teams flexibility for dialogue ducking, foreign‑language dubbing, or creating alternate “instrumental” and “vocal‑up” versions.