The BBFC is the independent British Board of Film Classification that classifies films, videos, games and other media in the UK. They consider many factors like context, tone, discrimination, drug use, horror elements, imitable behaviors, language, nudity, sex, themes and violence. More explicit or problematic depictions of these elements result in higher age ratings from U to 18. For example, A Clockwork Orange was initially banned but later received an 18 rating for its graphic violence. The document uses examples like World War Z and Shaun of the Dead to explain how factors like violence and gore impact the BBFC rating.