"M for Mature" is a video game content rating assigned by the Entertainment Software Rating Board (ESRB). This rating indicates that a game is suitable for players aged 17 and older due to its content, which may include intense violence, blood and gore, sexual content, and strong language. Games rated "M for Mature" often feature complex themes and narratives that may not be appropriate for younger audiences. Examples of such games include popular titles like Grand Theft Auto V and The Last of Us, which explore mature subject matter and require a certain level of emotional maturity to fully appreciate.