The term PG or R is a RATING system used to classify films and other media. The term stands for 'Parental Guidance' or 'RESTRICTED', which are two of the most common ratings given to films. PG films are generally suitable for all ages, while R films are RESTRICTED to viewers over the age of 17. The RATING system is used to inform viewers of the content of a film, so that they can make an informed decision about whether or not to watch it.