"Belle de Jour" is a 1967 French film directed by Luis Buñuel, based on the novel by Joseph Kessel. The story follows Séverine Serizy, a young housewife played by Catherine Deneuve, who leads a double life as a daytime prostitute while her husband is at work. The film explores themes of desire, fantasy, and the complexities of sexuality. The film is notable for its surreal imagery and psychological depth, characteristic of Buñuel's style. It received critical acclaim and has become a classic in world cinema, influencing many filmmakers and artists. The title refers to the French term for "daytime," highlighting the contrast between Séverine's two lives.