Hydrogen energy is increasingly recognized as a cornerstone of the global transition toward low-carbon and resilient energy systems, particularly for decarbonizing hard-to-electrify sectors such as industry, transport, and long-duration energy storage. This chapter provides a comprehensive global assessment of hydrogen energy systems by examining supply–demand dynamics, policy frameworks, and emerging technological pathways. It analyzes current and projected hydrogen production routes, end-use applications, and regional demand patterns shaping the global hydrogen economy. A strategic evaluation of hydrogen energy policies is presented, highlighting national roadmaps, regulatory instruments, market incentives, and international cooperation initiatives driving hydrogen deployment. This chapter further reviews the global technological landscape, covering advancements in hydrogen production, storage, transportation, and utilization technologies. By integrating policy analysis with technological insights, this chapter identifies key challenges, opportunities, and strategic directions necessary to scale hydrogen energy sustainably. The findings contribute to a deeper understanding of global hydrogen strategies and provide actionable insights for policymakers, industry stakeholders, and researchers advancing the hydrogen transition.