The film noir genre generally refers to mystery and crime dramas produced from the early 1940s to the late 1950s. Movies of this genre were characteristically shot in black and white, and featured stories involving femmes fatales, doomed heroes or anti-heroes, and tough, cynical detectives.
Neo-noir (English: New-black; from the Greek neo, new; and the French noir, black) is a style often seen in modern motion pictures and other forms that prominently use elements of film noir, but with updated themes, content, style, visual elements or media that were absent in film noir of the 1940s and 1950s.

Descriptions taken from Wikipedia.

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