Electrolyzers are devices that use electricity to split water into hydrogen and oxygen through a process called electrolysis. This process involves passing an electric current through water, which causes the water molecules to break apart. The hydrogen produced can be used as a clean fuel source, while the oxygen is released into the atmosphere. These devices play a crucial role in the transition to renewable energy, as they can store excess energy from sources like solar panels and wind turbines. By converting this energy into hydrogen, electrolyzers help create a sustainable energy system that reduces reliance on fossil fuels and lowers greenhouse gas emissions.