Closed captioning and subtitles has been part of accessible media in the since 1972 and has played a large role in the development of disability rights as well as civil rights in the United States. Created initially for the Deaf and hard-of-hearing, it has been implemented on a large scale since that time across television programming via video captioning and now on the Internet with YouTube closed captioning. The primary benefit of closed captioning services is to provide a convenient visual interpretation through text or symbol of televised audio content including speech, music and sound effects.
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