A plot twist is an unexpected change in the direction or outcome of a story, often surprising the audience. It can occur in various forms, such as revealing a character's true identity or altering the perceived motivations behind their actions. Plot twists are commonly used in literature, film, and television to enhance storytelling and keep the audience engaged. These twists can serve to challenge the audience's assumptions and encourage them to rethink earlier events in the narrative. Effective plot twists often rely on foreshadowing, where subtle hints are provided throughout the story, allowing for a satisfying revelation when the twist occurs. Examples of famous plot twists can be found in works by authors like Agatha Christie or films like The Sixth Sense.