Auteur Theory in FIlm

Auteur Theory explains that the director is the main author of the film It is not the writer but the director. And it says that the each director has different way to make a film or he or she will put his own trademark in the film that He will do. Like what we had discuss on our film class using Harry Potter as an example even though the 9 movies has the same story and all written by Rowling the movies has different Director whcih made some of the movies different from the rest.