Plato's writings had a profound impact on Western philosophy, particularly through the introduction of idealism and the theory of Forms. His dialogues introduced essential concepts regarding justice, ethics, and the nature of reality. Through characters like Socrates, Plato explored the significance of knowledge, virtue, and the examined life, laying the groundwork for epistemology and metaphysics. His political theories in "The Republic" address the ideal state and governance, influencing political thought for centuries. Plato's emphasis on rationality and the pursuit of truth remains central to philosophical inquiry, shaping discussions across various disciplines.