The Enlightenment was an intellectual movement in Europe from approximately 1600 to 1800 that emphasized reason and natural rights, influencing various thinkers like Thomas Hobbes, John Locke, and Voltaire. Key concepts included social contracts, separation of powers, and the need for individual freedoms, which laid the groundwork for modern democracy and legal systems. The era also saw advancements in science and philosophy, promoting ideas that led to significant political revolutions, including the American and French revolutions.