Hydrogen energy is a clean and renewable energy source that uses hydrogen gas to produce electricity. When hydrogen is burned or used in fuel cells, it combines with oxygen to create water, releasing energy in the process. This makes it an environmentally friendly alternative to fossil fuels, as it produces no harmful emissions. Hydrogen can be produced from various sources, including water, natural gas, and biomass. The most common method is electrolysis, which splits water into hydrogen and oxygen using electricity. As technology advances, hydrogen energy has the potential to play a significant role in reducing greenhouse gas emissions and combating climate change.