"Don Quixote" is a novel written by Miguel de Cervantes, first published in two parts in 1605 and 1615. The story follows Alonso Quixano, a middle-aged man who becomes obsessed with chivalric romances and decides to become a knight-errant, adopting the name Don Quixote. He embarks on adventures, believing he must revive chivalry and protect the helpless. Accompanied by his loyal squire, Sancho Panza, Don Quixote encounters various characters and situations that often lead to humorous misunderstandings. The novel explores themes of reality versus illusion, the nature of heroism, and the impact of literature on the human spirit.