CC or subtitle is used to displaying text on TV or video. For example, if the viewer cannot understand the content of the movie because of hearing impairment, or because of the need to watch the program without sound. At this time, CC subtitles can let people understand the content of the program according to the text, and will not be troubled by the lack of subtitles. Generally speaking, in movie theaters in the United States, if viewers need to watch videos through subtitles, they can choose to wear dedicated CC subtitle glasses, or directly choose to have CC subtitles. If you want to use CC subtitles on Youtube, you must first confirm whether the video supports CC subtitles. If the video has CC subtitles, you can click the "Settings" icon to select the subtitles you want. The subtitles you selected will be displayed below the clicked video.