The document discusses codes and conventions that are commonly used in documentaries to convey information and create meaning. It explains that conventions are generally accepted practices that documentaries typically follow. Some key conventions mentioned include using a presenter, interviews with experts, factual statistics, opinions from different perspectives, music to set mood, vox pops from the general public, archival and actual footage, and ensuring the mise-en-scene or setting supports the topic. It notes that while documentaries usually adhere to these conventions, some works like Casting JonBenet challenge conventions by focusing entirely on dramatization through actors reenacting events with their own opinions.