The branch of astronomy which deals with the origin of the universe is called cosmology. It focuses on the study of the constant evolution and eventual fate of the universe. The subject of cosmology is divided into physical cosmology, religious cosmology and philosophical cosmology. Physical cosmology makes use of mathematical principles to study the physical origin and evolution of the universe. Religious cosmology provides an explanation of the origin and evolution of the universe from religious perspectives. It may involve the description of a creator or a pantheon of deities. Philosophical cosmology deals with topics beyond scientific explanation. It is a multidisciplinary field of philosophy which draws on epistemology, metaphysics, philosophies of science and fundamental physics. This book provides comprehensive insights into the field of cosmology. It provides significant information of this discipline to help develop a good understanding of cosmology and related fields. This book is an essential guide for both academicians and those who wish to pursue this discipline further.