Closed captioning and complete transcripts for audio and video files are important for those with visual and hearing impairments.
If you make use of audio or video on your website, consider using a third-party service that includes closed captioning and transcription tools, or supports the addition of them. These include:
Using a third-party service can save you time and also allows you to serve your media on a variety of devices, which can be a challenge when serving media you are hosting yourself.