In the world of literature, the concept of 'the unreliable narrator' is a critical device used in storytelling. An unreliable narrator is a character whose credibility is compromised, making it difficult for readers to discern the truth of the narrative. This technique forces readers to engage more critically with the text, often leading to multiple interpretations of the story. Common reasons for a narrator’s unreliability can include emotional instability, prejudice, or a lack of knowledge about the events they are recounting. Famous examples of novels featuring unreliable narrators include 'The Catcher in the Rye' by J.D. Salinger and 'The Great Gatsby' by F. Scott Fitzgerald, where the perspective of the narrator significantly influences how the story is perceived.