Black and white films are movies that use only shades of gray, without color. This style was prevalent from the early 1900s until the late 1960s, when color film became more common. The absence of color can create a unique atmosphere, emphasizing light, shadow, and composition. Many classic films, such as Casablanca and Citizen Kane, are celebrated for their artistic use of black and white. Filmmakers often use this technique to evoke nostalgia or to focus on storytelling and character development, allowing viewers to engage more deeply with the narrative.