Philosophy is the pursuit of knowledge. It is the knowledge of the eternal and essential nature of things. Aristotle says that 'Philosophy begins in wonder' or man's instinct of curiosity. Indian philosophy is one of the richest philosophical traditions of the world. The Indian epistemological tradition comprises six important sources of knowledge. They are: perception (pratyaksa), inference (anumana), verbal testimony (sabda), comparison (upamana), presupposition (arthapatti) and nonapprehension (anupalabdhi). Epistemology is a branch of philosophhy that is concerned with various theories of knowledge. It enquires into the origin of knowledge and the conditions of its validity. Indian epistemology is rich in terms of its content and logical reasoning. Epistemology probably made its first appearance in Western Philosophy when the critical reflection of the Greek sophists brought the speculations of their predecessors into question. The general problems of the theory of knowledge were further enriched in the tradition of Western philosophy. Along with metaphysics, logic and ethics, epistemology is one of the four main branches of philosophy. It is a branch of philosophy that is concerned with various theories of knowledge. It is a discipline that studies the nature, origin and limits of knowledge. It enquires into the origin of knowledge and the conditions of its validity. This book, is designed keeping in mind the self-instruction mode format and follows a simple pattern.