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Search engines can use the text in the captions to index the video, making it more discoverable.
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Accessibility: Captions provide access to the video content for people who are deaf or hard of hearing.There are several reasons why captions are important for videos: Without captions, those who are deaf, hard of hearing, or cannot hear the audio may have difficulty accessing your content. Video captions are text versions of all the dialogue and important audio cues synchronized with a video. All videos produced should have captions available including all spoken words and important sound effects.
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