Provide Alternatives for Time-based Media
Time-based media is prerecorded or live audio-only, video-only or both together as synchronized media. Providing alternatives for these media types will enable millions of people who are deaf or hard of hearing to benefit from the content within your media. It also helps people who need to access the media but are in a quiet public space with no headphones. Plus it gives a way for people on devices with too low of bandwidth to play the media to still read the content. When you provide text transcripts, search engines will index the content making it searchable by all.