The BBFC examines films and videos before public release to assign age ratings based on criteria for issues like discrimination, drugs, horror, dangerous behavior, language, nudity, sex, and violence. They view entire films and use their Classification Guidelines to determine the appropriate rating. For physical media like DVDs and Blu-rays, only one examiner is needed. They also work with online services to apply age ratings to downloaded and streamed video content to help parents choose suitable content for children.