I think Film noir is a Hollywood crime drama, particularly those that emphasize cynical attitudes and sexual motivations and associated with a low key black and white visual style that has a root in German Expressionist cinematography. I think that film noir is a genre, style and movement.
Film noir has given this name because of how the acts locations, people on the screen are seen, it is usually dark and black. And film noir has a common themes corruption, deceit, mystery. And as I read about “film noir” is portrayal of the “femme fatal” therefore, it would seem to support the existing social order and particularly its rigidly defined gender roles.
Film noir would seem to have a large following, from melodramas to westerns, detective movies and even musical. The uncommon use of light, shadow and cinematography would have a very artistic appeal.