Most people use these two words interchangeably. But in reality, there is a difference: - The movie is the CONTENT/DATA. - The film is the MEDIUM that stores/contains the content. In other words, the film contains the movie. Playing the film plays the movie. Analogs: A vinyl/record contains one or more songs. A CD contains many songs. A tape contains many songs. A DVD contains a movie.

The first is Americal English, the second is British English.