The Enlightenment was an intellectual movement in the 18th century emphasizing reason, skepticism towards traditional authority, and the betterment of humanity through rational thought. It originated in France and influenced various fields such as philosophy, science, and politics, with notable figures including Voltaire, John Locke, and Montesquieu advocating for natural rights and government systems based on reason and social contracts. The ideas from this period led to profound societal changes and laid the groundwork for modern democratic principles and revolutions across Europe and the Americas.