The term 'gritty genre' is often used to describe the film NOIR genre, which originated in the 1940s. NOIR films are characterized by their dark and cynical themes, as well as their use of black-and-white cinematography. These films often feature morally ambiguous characters and a sense of fatalism, and often explore themes such as crime, corruption, and moral ambiguity. NOIR films are often set in urban environments and feature a strong sense of atmosphere and suspense.