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The global energy landscape is undergoing a profound transformation. As the consequences of fossil fuel dependence become increasingly apparent through climate change, resource depletion, and geopolitical instability, the imperative to develop clean, renewable energy alternatives has never been more urgent. Among the spectrum of renewable energy technologies available today, biogas stands out as a particularly versatile, economically viable, and environmentally meaningful solution. This book was conceived with a dual purpose: to serve as a rigorous academic reference for researchers, engineers, and graduate students, and to provide actionable knowledge for practitioners and policymakers working at the interface of energy, agriculture, waste management, and sustainable development. The text draws upon decades of accumulated scientific literature, integrating classical theories with the most recent advances in the field. Biogas is not a new technology. Anaerobic digestion has been employed for over a century in wastewater treatment, and rural biogas programmes in China and India have been in operation since the mid-twentieth century. Yet the scientific understanding of the underlying microbial processes, the engineering innovations in reactor design, and the expanding portfolio of feedstocks have transformed biogas into a twenty-first century technology of considerable sophistication and commercial maturity. The book is organized into ten chapters that collectively span the entire spectrum of biogas science and technology. It begins with an introduction to the global energy context and the role of renewable energy, before moving through the fundamentals of anaerobic digestion, the diversity of feedstock materials, reactor engineering, and gas upgrading technologies. Dedicated chapters address experimental methodologies, results and interpretation, economic analysis, and environmental impact assessment. A comprehensive review of the global literature is incorporated to situate current knowledge within its historical and scientific context. The experimental methods chapter is particularly noteworthy, as it provides detailed protocols for biochemical methane potential assays, pilot-scale digester operation, analytical measurements, and statistical approaches to data interpretation. These methods are described with sufficient detail that researchers should be able to replicate reported procedures in their own laboratories. Sixty peer-reviewed references are cited throughout the text, representing key contributions from leading journals including Bioresource Technology, Renewable and Sustainable Energy Reviews, Applied Energy, Waste Management, and the Journal of Cleaner Production. These references collectively provide a gateway to the broader literature for readers who wish to explore specific topics in greater depth. It is the sincere hope of the author that this work contributes meaningfully to the advancement of biogas science and technology, and to the broader transition toward a sustainable, low-carbon energy future.