This document provides an overview of philosophical liberalism. It discusses how liberalism emerged in the 18th century during the Age of Enlightenment and focused on individual liberties and rights. Tolerance is described as an essential element of liberalism. The document also outlines some of the basic characteristics of liberalism, such as being pragmatic, pluralistic, and supporting a free economy. Key leaders in philosophical liberalism like John Locke, David Hume, and Jean-Jacques Rousseau are also mentioned.