Audio

Audio:
Narration added to the soundtrack to describe important visual details that cannot be understood from the main soundtrack alone.  Audio description is a means to inform individuals who are blind or who have low vision about visual content essential for comprehension.  Audio description of video provides information about actions, characters, scene changes, on-screen text, and other visual content.  Audio description supplements the regular audio track of a program.  Audio description is usually added during existing pauses in dialogue. Audio description is also called “video description” and “descriptive narration”.