CLOSED CAPTIONS AND SUBTITLES FOR THE HARD OF HEARING
Closed Captions (CC) are same language files that are meant for the deaf and hard of hearing, and they can be turned on and off by the viewer. In addition to dialogue, they contain descriptions of sounds as well as identifiers for speakers. Except for the USA and Canada, most countries do not distinguish between subtitles and closed captions. "Subtitles" is used as the general term. The equivalent of "captioning" is usually referred to as "subtitles for the hard of hearing" or "SDH" for short.
CCs or SDHs are required by law in many countries, and they have strict guidelines for captioning/subtitling television programs and live broadcasts, with specific standards on caption accuracy, timing, placement, and completeness.