The document discusses the difference between codes and conventions in media. Codes are specific signs and symbols used in individual media texts, while conventions are techniques and styles that are commonly used within an entire genre. Technical codes use techniques like cinematography and editing to convey meaning, while symbolic codes represent hidden meanings through characters' behaviors. Technical conventions are standardized practices like title sequences, and genre conventions are styles associated with a particular genre, such as themes in high school dramas. The document then provides an analysis of the film "Garage 32b" and discusses how it uses codes and follows conventions as an independent youth drama.