A novelization or novelisation is a novel that is written based on some other media story form rather than as an original work.
Novelizations of films usually add background material not found in the original work to flesh out the story, because novels are generally longer than screenplays. Similarly, material from the screenplay or filmed scenes that are cut from the final production may still be present in a novelization, often because the novel is completed for publication while the film is still being edited for release. The practice was particularly popular for successful films and television series before the advent of home video, which gave people the ability to record programs or buy commercial releases for repeated viewing.