A film adaptation transfers the details or story of an existing source text, such as a novel, into a feature film. This transfer can involve adapting most details of the source text closely, including characters or plot points, or the original source can serve as loose inspiration, with the implementation of only a few details. Although often considered a type of derivative work, film adaptation has been conceptualized recently by academic scholars such as Robert Stam as a dialogic process.
While the most common form of film adaptation is the use of a novel as the basis, other works adapted into films include non-fiction (including journalism), autobiographical works, comic books, scriptures, plays, historical sources and even other films. Adaptation from such diverse resources has been a ubiquitous practice of filmmaking since the earliest days of cinema in nineteenth-century Europe. In contrast to when making a remake, movie directors usually take more creative liberties when creating a film adaptation, changing the context of factors such as audience or genre.
