The document discusses the key ideas and figures of the Enlightenment period in the 18th century. It explains how the Enlightenment built upon the Scientific Revolution by applying rational thinking to understand human society and governance. It outlines philosophers like Voltaire, Rousseau, and Montesquieu and their criticisms of religious institutions and absolutist rule. It also highlights the importance of Diderot's Encyclopedia in disseminating knowledge widely and fueling public debate during the Enlightenment.