Transcription turns audio or video into written text. Subtitling prepares timed on-screen text for viewers. Captioning adds accessibility context such as speakers, sounds and music cues.
If you need a written record, request transcription. If you need translated or same-language text on screen, request subtitles. If accessibility is the priority, request captions.
Many video projects need more than one service. A transcript can become the base for subtitles, captions, translation and voice-over scripts.