Subtitles and captions provide missing information for people who have difficulty understanding speech in visual media (whether these difficulties are due to hearing loss or cognitive delay).
Subtitling and captioning is essential for deaf and hard of hearing viewers, can be very useful for those learning a new language, and can help people with reading problems.
Subtitling and captioning provides greater ability to understand the content compared to viewers watching the same media without subtitles.
Subtitling and captioning helps learn content-related vocabulary (in business, science, technology and other subjects) - viewers see both the terminology (written word) and the visual image.
Subtitles and captions help you make it easier to find your video content on the web using search engines.
Subtitles and captions allow you to make your video content accessible to any language audience.