Mechanically scanned television broadcasts began in 1928, and electronically scanned broadcasts began in 1936. Television was initially monochrome and color was introduced in the 1950s. It also used terrestrial broadcasting through ground-based transmitters. Later, cable television via overhead and/or underground wiring and then satellite television was introduced, both of which became common in the 1980s. More recently, since the mid 2000s, television has increasingly moved from analog to digital technology.
Subtitles are textual versions of the dialog in films and television programs, usually displayed at the bottom of the screen. They can either be a form of written translation of a dialog in a foreign language, or a written rendering of the dialog in the same language—with or without added information intended to help viewers who are deaf and hard-of-hearing to follow the dialog.