A movie remake uses an earlier movie as its main source material, rather than returning to the earlier movie's source material.
With the exception of shot-for-shot remakes, most remakes make significant changes in character, plot, genre, and theme. Sometimes a remake is made by the same director. Not all remakes use the same title as the previously released version. Remakes are rarely sequels to the original film. In this situation, essentially the remake repeats the same basic story of the original film and may even use the same title, but also contains notable plot and storyline elements indicating the two films are set in "the same universe". The Italian film Perfect Strangers was included in the Guinness World Records as it became the most remade film in cinema history, with a total of 18 versions of the film.