Philosophical novels are literary works that explore fundamental questions about existence, morality, and human nature through narrative. These novels often feature characters who engage in deep discussions or face dilemmas that reflect philosophical ideas, encouraging readers to think critically about their own beliefs and values. Notable examples of philosophical novels include Friedrich Nietzsche's "Thus Spoke Zarathustra" and Albert Camus' "The Stranger." These works not only tell a story but also invite readers to ponder concepts such as existentialism, absurdism, and the nature of reality, making them significant in both literature and philosophy.