The British Board of Film Classification introduced the first film rating system in 1912 to provide safety ratings for movies. Over time, the system evolved to include additional ratings like "H" for horror in 1932, and divisions of the "A" rating in 1970 into categories based on audience age. Further changes included introducing a "PG" rating in 1982 and making the BBFC legally responsible for ratings in 1985. Different countries now have their own unique film classification systems to help determine appropriate audience age levels for viewing movies.