Captions are a visual depiction of the soundtrack of a video program or film.
Unlike subtitles, which merely translate the dialogue or narration, captions include song lyrics, a description of sound effects, and an indication of who is speaking and any special vocal inflection. Originally, captioning was developed to assist people who are deaf or hard of hearing. Today, people who are learning English as a second language and people who are trying to improve their literacy skills watch captioned video. Captioning is an inexpensive and practical way to provide accessibility and increase understanding for all viewers. Public Service Announcements funded with federal government monies must be captioned.