The document outlines the different age ratings used by the British Board of Film Classification (BBFC) to classify films and videos in the United Kingdom. U means suitable for all ages, while PG, 12, 12A, 15, and 18 ratings specify the minimum age restrictions for viewing. The 12 and 12A ratings differ in that 12 is only for videos/DVDs while 12A is for films in cinemas. The R18 rating is legally restricted and allows explicit adult content to be shown only in licensed venues for adults.