Genres have sets of recognizable features that help audiences understand what to expect in a given text. Audiences enjoy predicting what will happen based on their knowledge of genres, but also appreciate some unexpected elements to prevent boredom. Producers rely on genres to communicate easily with audiences. However, defining genres is difficult as they are dynamic and constantly evolving as elements from different genres combine to form new genres. Genre theory proposes that genres can be understood through their semantic or syntactic elements, with semantics referring to visual conventions and syntax referring to narrative structures and relationships between elements.