This book chapter offers an overview of the importance of hydrogen energy, especially green hydrogen, as a solution to the pressing need for transitioning to sustainable and renewable energy sources in the context of climate change. The chapter also highlights the properties and advantages of hydrogen as a clean energy carrier, explores its historical context and technological advancements, and delves into its diverse applications in different sectors. Additionally, the chapter discusses the global initiatives, strategies, and challenges associated with adopting hydrogen energy, emphasizing the importance of overcoming these challenges for successfully integrating hydrogen into the global renewable energy landscape.