This book offers a thorough exploration of hydrogen technologies, emphasizing their production, storage, and fuel cell applications. It delves into innovative hydrogen generation methods, including electrolysis, photocatalysis, and biological techniques. Additionally, it covers advanced storage solutions such as metal hydrides, MOFs, LOHCs, and cryogenic storage, and details how hydrogen can be integrated into fuel cells for use in transportation, industry, and grid applications. By bridging the gap between fundamental hydrogen science and practical applications, the book incorporates insights from material science, engineering, and policy-making to provide a comprehensive view of hydrogen?s role in the global energy transition.