A remake is a film or television series that is based on an earlier work and tells the same, or a very similar, story.
The term "remake" is generally used in reference to a movie which uses an earlier movie as the main source material, rather than in reference to a second, later movie based on the same source. For example, 2001's Ocean's Eleven is a remake of Ocean's 11, while 1989's Batman is a re-interpretation of the comic book source material which also inspired 1966's Batman. In 1998, Gus Van Sant produced an almost shot-for-shot remake of Alfred Hitchcock's 1960 film Psycho.