Videos and video lectures are great to use in teaching. Providing captions, audio descriptions and transcripts make your videos accessible to a wide audience,
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Captions are text versions of the audio content, synchronized with the video.
Audio Descriptions are commentary and narration which guides the listener through the movie, tv show, theater or other art form with concise, objective descriptions of new scenes, settings, costumes, body language, and "sight gags," all slipped in between portions of dialogue or songs.
Still not totally sure what audio descriptions are and how they are different from captions? Play these 2 videos of the same trailer for movie Frozen to see the difference.