A Hollywood movie is generally defined as a film produced by one of the major American film studios, such as Warner Bros, Paramount, or Disney. These major studios, along with theaters, make up the Hollywood film industry. Some key film genres produced in Hollywood include action, adventure, crime/gangster, horror, and others. Genre is important for marketing films and appealing to audiences interested in specific genres. Some major directors and producers in Hollywood history include Steven Spielberg and Quentin Tarantino. The basic steps to create a movie involve writing a script, casting, filming, and editing.