Genre Theory explores how films are categorized based on shared conventions, themes, and styles. It provides a framework for understanding different types of films, helping viewers set expectations and interpret meaning. This theory recognizes that genres evolve over time and can blend elements from multiple categories. Film genres have roots in early cinema, drawing from literary and theatrical traditions. Key genres like Western, horror, and musical emerged in the early 20th century. As cinema evolved, new genres developed, reflecting changing social, cultural, and technological contexts. Modern films often subvert or blend traditional genre conventions.