<P> The MPAA rating system is one of various motion picture rating systems that are used to help parents decide what films are appropriate for their children . It is administered by the Classification & Ratings Administration (CARA), an independent division of the MPAA . </P> <P> The MPAA film ratings are as follows: </P> <Table> <Tr> <Th> Rating symbol </Th> <Th> Meaning </Th> </Tr> <Tr> <Td> </Td> <Td> <Dl> <Dt> G--General Audiences </Dt> <Dd> All ages admitted . Nothing that would offend parents for viewing by children . </Dd> </Dl> </Td> </Tr> <Tr> <Td> </Td> <Td> <Dl> <Dt> PG--Parental Guidance Suggested </Dt> <Dd> Some material may not be suitable for children . Parents urged to give "parental guidance". May contain some material parents might not like for their young children . </Dd> </Dl> </Td> </Tr> <Tr> <Td> </Td> <Td> <Dl> <Dt> PG - 13--Parents Strongly Cautioned </Dt> <Dd> Some material may be inappropriate for children under 13 . Parents are urged to be cautious . Some material may be inappropriate for pre-teenagers . </Dd> </Dl> </Td> </Tr> <Tr> <Td> </Td> <Td> <Dl> <Dt> R--Restricted </Dt> <Dd> Under 17 requires accompanying parent or adult guardian . Contains some adult material . Parents are urged to learn more about the film before taking their young children with them . </Dd> </Dl> </Td> </Tr> <Tr> <Td> </Td> <Td> <Dl> <Dt> NC - 17--Adults Only </Dt> <Dd> No One 17 and Under Admitted . Clearly adult . Children are not admitted . </Dd> </Dl> </Td> </Tr> </Table> <Tr> <Th> Rating symbol </Th> <Th> Meaning </Th> </Tr>

What is the difference between pg 13 and rated r
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