Don Quijote de la Mancha is a novel written by Miguel de Cervantes, first published in two parts in 1605 and 1615. It tells the story of an aging nobleman who becomes so enamored with chivalric tales that he sets out on a quest to revive knighthood, adopting the name Don Quijote. This work is often regarded as one of the first modern novels and serves as a profound exploration of reality versus illusion, highlighting themes of idealism, social critique, and the nature of human experience.