Film Noir as appointed by many sources is a film sub-genre that first developed in the United States.
In an early stage, noir films applied a bold visual style that highlighted the use of black and white contrasts, of shadows, of mirrors and textures (such as cigarette smoke) to the American hard-boiled movement – detective stories.
However, as this style developed, this noir influence quickly extended to other genres such as western, war, family dramas, romance, etc.