Film noir first developed in the 1950s as a genre of stylish crime dramas shot in black and white with low-key lighting and cinematography featuring low angles and obscured faces. Over time, subgenres like horror noir and superhero noir emerged. Film noir typically uses urban settings, narratives involving murder and punishment, and characters like detectives and femme fatales. Editing employs techniques like flashbacks and manipulating day into night, while soundtracks use jazz music, heavy breathing, and silence for effect. The document provides examples of how a sample trailer incorporates conventions of film noir cinematography, lighting, narrative, and editing.