R18 is a classification used to indicate that a film, video game, or other media is intended for adults only. This rating typically signifies that the content may include explicit sexual themes, graphic violence, or strong language, making it unsuitable for viewers under 18 years of age. In many countries, the R18 rating helps guide consumers in making informed choices about the media they consume. It is part of a broader system of ratings, which may include categories like PG, PG-13, and R, each designed to inform audiences about the nature of the content.