The document discusses the definition and branches of philosophy. It begins by defining philosophy as the love of wisdom, derived from the Greek words "philos" meaning love and "sophia" meaning wisdom. The main branches of philosophy are discussed as metaphysics, epistemology, axiology, and logic. Epistemology is then defined as the philosophical study of the nature, origin, and justification of human knowledge. The document goes on to discuss various definitions of knowledge put forth by Plato, Locke, and Dewey.