Film noir emerged in 1940s American cinema, exploring dark themes and moral ambiguity. These films reflected post-World War II disillusionment through crime dramas and psychological thrillers, using distinct visual styles and character archetypes. Influenced by German Expressionism and hardboiled fiction, noir challenged traditional values. It employed high-contrast lighting, unusual camera angles, and non-linear storytelling to create a sense of unease and explore the complexities of human nature.