Audio description is an additional narrated track that describes the on-screen visual action — who entered, what they're doing, a key gesture — in the gaps between dialogue, so blind and low-vision viewers can follow the story. It is delivered as its own audio rendition, either pre-mixed with the program or, in newer object-based systems, as a separate object the receiver mixes in. Accessibility regulations in the US (FCC/CVAA), the EU (EAA), Canada, and the UK mandate it for broadcasters and increasingly for streaming, with minimum hours and discoverability requirements. Producing it well is a craft: timing, level, and word economy decide whether the description helps or talks over the moment.
