The Enlightenment was an 18th century intellectual movement that promoted rational thinking and scientific inquiry over religious dogma and tradition. Enlightenment thinkers applied scientific principles to philosophy and politics and advocated the use of reason to reform society. Key figures like Locke, Montesquieu, Voltaire, and Rousseau influenced revolutions in America and France and shaped modern concepts of government, rights, and education. Enlightenment principles also inspired reforms by monarchs across Europe seeking to modernize their nations according to rational principles.