Introduction to biogas, including its technology as well as principles, has been provided in this well-structured and descriptive book. It encompasses numerous research reports demonstrating sequential production of biogas and also discusses the principles and mechanisms involved in its operation. The efficacy of technologies adopted for the production of biogas, specifically anaerobic digestion of waste and gas production systems, its structure, mechanism and other aspects of the process, applications and purification of biogas, architecture of pipes and plants, evaluation of environmental facets, economic issues and a few other topics which hold importance in any aspect of biogas generation have been examined in the book.