U films are suitable for all ages 4 and over and can only briefly show sexual/violent content or anti-drug messages. PG means parental guidance is advised as films may contain slightly more adult themes. 12A means children of any age can attend with an adult and contains mild language, violence, and sexuality. 15 ratings allow more graphic violence, language, sexuality, and drug use but can't promote or encourage harmful behaviors. 18 ratings are for adults only and can include very strong language, violence, sexual content, and themes not suitable for minors. The document discusses creating an 18 rated thriller to fill a gap in the popular but less common 18 rated thriller genre.