Film noir is a style of filmmaking characterized by low-key lighting, shadows, and visual elements that create a dark, gloomy mood. Key props include cigarettes, alcohol, guns, suits, and tight dresses. Stories typically involve a police or private detective investigating crimes motivated by jealousy or greed, and often feature adulterous affairs, fractured timelines, and voiceovers. Main characters are usually private detectives or concerned bystanders investigating corruption.