The BBFC is an independent regulator that classifies media content in the UK according to age ratings to protect audiences, especially children. They consider factors like discrimination, horror, imitable behavior, language, nudity, sex, themes, and violence. Context and tone are also important. The document discusses classifying a film with a 15 rating due to infrequent scenes of violence and dark images that are not graphic. Themes of depression, conflict, and horror are present but not the focus. A 15 rating ensures the target audience is mature enough to understand these themes without risk of harm.