Timed Text refers to the presentation of text media in synchrony with other media, such as audio and video. Typical applications of timed text are the real time subtitling of foreign-language movies on the Web, captioning for people lacking audio devices or having hearing impairments, karaoke, scrolling news items or teleprompter applications. Timed text for MPEG-4 movies and cellphone media is specified in MPEG-4 Part 17, and is also referred to by RFC 3839.