Genre theory classifies films into a small number of categories based on common traits. Genres help audiences and studios determine what types of films to watch and produce. Recognizing a film's genre allows viewers to feel familiar with its conventions and compare it to similar works. However, deviations from conventions can confuse audiences while also providing enjoyment from broken rules. Contemporary genre theory sees genres as dynamic forms that change with society and values rather than fixed categories. Film theorists argue that pure genres no longer exist as audiences have grown tired of formulas, requiring genres to hybridize conventions to remain appealing and difficult to categorize.