Electrolysers have emerged from industrial obscurity into the limelight due to the global push for green hydrogen production. This article delves into the differences between Alkaline and Proton Exchange Membrane (PEM) electrolyser technologies, highlighting their unique characteristics and applications. PEM electrolysers are preferred for high-purity hydrogen production while alkaline electrolysers excel in large-scale applications. The global market, dominated by alkaline electrolysers, is witnessing a shift towards PEM technology driven by the increasing demand for green hydrogen, especially in regions like the US, European Union, and China. The article also discusses the market trends, with China currently leading in global electrolyser capacity but showing a gradual transition towards PEM electrolysers. The growth potential for PEM technology is substantiated by a projected CAGR of 32.7% from 2024 to 2030, indicating a positive industry outlook. Major industry players like BASF, Plug Power Inc., and Cummins are heavily investing in PEM electrolysis, with significant projects underway to strengthen the green hydrogen infrastructure. Moreover, the article highlights the Asia Pacific region as a promising market for electrolysers, particularly emphasizing the growing adoption of PEM technology to meet green hydrogen and transportation goals. The surge in green hydrogen initiatives worldwide, supported by government incentives and investments, is propelling the electrolyser market towards sustainable and efficient solutions for hydrogen production.