G - General Audiences: These movies are basically ok for everyone to see and there is nothing offensive. Impolite conversations at most.
PG - Parental Guidance Suggested: These movies might have some scenes that are offensive for children in terms of explicit language and may have at most moderate levels of violence.
PG-13 - Parents Strongly Cautioned: Contains scenes inappropriate for children under 13 years of age. Contains no sexually oriented nudity or continuous harsh violence.
R – Restricted: Not for children under 17 (may be accompanied with parent depending on laws of location and theatres). These movies contain explicit language, dark themes, inappropriate portrayal of sex, violence and drugs.
IMDb rating: These ratings are given by the general audiences like us. Though, these ratings maybe skewed due to audience bias/apathy.
Rotten Tomatoes rating: These are given by professional movie critics, if that is something you trust more.
Speaking of which, how does the box office performance of a movie relate with its IMDb rating? Let’s take a look on the plot below.