Film noir conventions refer to a set of stylistic and thematic elements commonly found in film noir, a cinematic genre that emerged in the 1940s and 1950s. These conventions often include a moody, atmospheric visual style, morally ambiguous characters, and complex narratives involving crime, betrayal, and existential despair. Understanding these conventions is crucial for analyzing how filmmakers use visual language to evoke specific emotions and portray themes of darkness and moral ambiguity.