Genre theory is used to categorize films based on various factors like storyline, director, and audience expectations. Several theorists have proposed different views on genre. Steve Neale believes genres are constantly evolving through five stages from early forms to parodies. Robert Stam argued that genres are difficult to define due to problems like categories being too broad or narrow. Rick Altman defined genres as having either semantic or synaptic elements relating to visuals/themes. Bordwell suggested there is no empirical way to classify films into genres since interpretations vary between individuals. Studying genre theory has expanded the author's understanding of the complex issue of film classification.