Include a transcript with your audio only files
Make sure your audio file includes an Accurate and complete transcript. A transcript is a text version of exactly what is being said in the audio-only file.
Add a text description to your video only files
Make sure your video includes an Accurate and complete text description. A description is a text version of what is being shown in a video-only file.
Add captions and audio description to your multimedia (audio and video) files
Make sure your file includes Accurate and complete synchronized captions and audio descriptions. Captions are a time-synchronized text version of exactly what is being said and/or a description of the relevant sounds in the multimedia file. Audio descriptions are time-synchronized descriptions of what is being shown in the multimedia file.