This review article explores the advantages of biogas technologies, particularly those based on agricultural waste, and discusses the principles of biogas production through anaerobic digestion (AD). Key parameters such as temperature, pH, retention time, and organic loading rate (OLR) are highlighted as crucial for process efficiency. The article emphasizes the importance of substrate selection and the benefits of using organic waste in a circular economy and sustainable development context. It also addresses the need to treat and purify biogas to enhance its conversion into electricity. The design, construction, operation, and economic aspects of biogas plants are covered, including cost and benefit analyses. The global development of biogas plants is discussed, noting that most installations are located in Asia and Europe, with China leading in the number of biogas plants. The article concludes by discussing opportunities and barriers to biogas plant development, including financial issues, feedstock availability, political regulations, public awareness, and geopolitical situations.This review article explores the advantages of biogas technologies, particularly those based on agricultural waste, and discusses the principles of biogas production through anaerobic digestion (AD). Key parameters such as temperature, pH, retention time, and organic loading rate (OLR) are highlighted as crucial for process efficiency. The article emphasizes the importance of substrate selection and the benefits of using organic waste in a circular economy and sustainable development context. It also addresses the need to treat and purify biogas to enhance its conversion into electricity. The design, construction, operation, and economic aspects of biogas plants are covered, including cost and benefit analyses. The global development of biogas plants is discussed, noting that most installations are located in Asia and Europe, with China leading in the number of biogas plants. The article concludes by discussing opportunities and barriers to biogas plant development, including financial issues, feedstock availability, political regulations, public awareness, and geopolitical situations.