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Audio and video are often a welcome addition to a Web-based course. They can describe a complex concept, show a process, provide two-way communication (via teleconference), or simply add a "human touch" to courses taught at a distance. However, students with hearing, mobility, or visual impairments may not be able to receive the information you worked so hard to provide.
This section describes how to make sure all your students benefit from online audio and video. These techniques help students who can't hear audio or see video—including students without sufficient bandwidth, software, or speakers.
There are four main techniques for creating accessible audio and video:
Accessible File Types
Accessible online audio or video can be played in any  media player.
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Transcripts
Transcripts provide an accessible text version of audio or video narration.
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Captions
Captions synchronize audio and visuals for students who cannot hear sound.
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Audio Descriptions
Audio descriptions explain visual information to students who are blind.
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