The world is currently experiencing an energy transition phase aimed at reducing carbon emissions in industries and entire economies. With over 140 countries committing to net-zero targets, covering a significant portion of global emissions, the focus is on finding ways to limit emissions in various sectors like industrial operations, transport, and power. One prominent solution in this transition is the adoption of low-/zero-carbon hydrogen, known as green or blue hydrogen, which will have a substantial impact on global decarbonisation efforts. Green hydrogen is produced using renewable energy sources, while blue hydrogen is generated from natural gas with carbon capture technology. Both forms are crucial in the shift towards a cleaner and sustainable energy landscape. The 2025 Hydrogen Market Databook highlights the importance of green and blue hydrogen in driving the energy transition and showcases the varying forecasts for future demand. As the world progresses towards a greener future, the role of hydrogen, particularly green and blue hydrogen, will be instrumental in achieving emission reduction targets and building a sustainable energy ecosystem.