The article discusses the potential of hydrogen as a low-carbon alternative reductant to fossil fuels in the context of iron production, aiming to reduce emissions. The use of hydrogen as a reducing agent for iron oxides is explored through diagrams such as the Ellingham diagram and Baur-Glässner diagram, which depict the thermodynamics and reactions involved. Three main pathways for hydrogen-based reduction in steel production are highlighted: hydrogen-based direct reduction (H2DRI), hydrogen plasma reduction (HPR), and hydrogen smelting. Among these, hydrogen-based direct reduction (H2DRI) stands out as a promising method due to its low CO2 emissions, theoretical feasibility, and scalability. The article delves into the complex chemical reactions involved in H2DRI, emphasizing the importance of supplemental heating for thermal management. It also discusses the kinetics of hydrogen reduction reactions, highlighting temperature as a crucial factor affecting the rate of iron reduction. Overall, the article presents hydrogen as a positive alternative for reducing emissions in iron production, providing insights into the potential of hydrogen as a clean reductant in the steel industry.