A koan is a paradoxical statement or question used in Zen Buddhism to provoke deep thought and meditation. It often defies logical reasoning, encouraging practitioners to transcend conventional thinking and gain insight into the nature of reality. Typically presented by a Zen master to a student, koans serve as a tool for spiritual awakening. One famous example is, "What is the sound of one hand clapping?" Engaging with koans can lead to moments of clarity and enlightenment, helping individuals explore their own understanding of existence and consciousness.