The visuals of film noir are deeply influenced by German expressionism in the 1920’s. With the increasing opportunities which were offered by Hollywood, in the late 1920’s many people fled from Nazi occupied Germany, to America, including many directors and producers. Because the time of mass emigration from Germany , many of the cinematic artists had been involved or closely linked to the expressionist movement, which brought to Hollywood 
   Even though the noir style originated from Germany, the actual phrase “film noir” was created in France by film critic Nino Frank in 1946.It literally meant (black film)  in French and described the visual appearance of the genre, including high contrast shadows and even could be linked to the darker storyline that became popular.
    These types of films became highly popular after the Second World War as they were quick and easy to make, which was important after the financial state of America 
Crime and usually murder, is an element of almost all film noirs, they tend to revolve around heroes who are more flawed and “shifty” than what is usually expected of the hero figure. It’s hard to define whether “film noir” is a genre or its own style, many people would argue that the average plot or storyline of a film noir would indeed be able to be put under genres such as crime, drama or mystery and so the “film noir” title would be little more than a style. However it could also be argued that film noirs contain characteristics, unique to that type of film and so would class it as an independent genre.
  
