Film Noir is a movie genre who has a characteristics of darkness and shadows. A film noir has this ambiance since it means black. It needs to be mysterious. It has the presence of a femme fatale, a dangerous woman who looks so innocent at first but has dark plans after.
This kind of film is always seductive and it also has murder stories. It is also visually artistic because of the fog and smoke that the filmmakers put in the movie.
Film Noir is a black film because the murderer in the film is not put in jail. Because of this, the audience are shock because the movies before don't have an ending just like in a film noir. Meaning, the antagonist is always in victory even though she is bad. The femme fatale is always the antagonist in the story since she has also the mysterious part which is her dark side.
The urban setting of a film noir is often set in cities.