This process is known as "electrolysis" and is an important method for clean energy production. The electrolyzer contains two electrodes (anode and cathode) and an electrolyte. An electric current passes through the electrodes, splitting water molecules into oxygen and hydrogen gas. Oxygen gas is formed at the anode, while hydrogen gas is formed at the cathode. When used in combination with renewable energy sources, hydrogen electrolyzers produce green hydrogen, a sustainable energy source that reduces carbon emissions. There are different types, such as alkaline, proton exchange membrane (PEM) and solid oxide electrolyzers (SOE), and each offers specific advantages.