Hydrogen energy is a clean and renewable energy source that uses hydrogen gas to produce power. When hydrogen is burned or used in fuel cells, it combines with oxygen to create electricity, with water as the only byproduct. This makes it an environmentally friendly alternative to fossil fuels, which release harmful emissions. Hydrogen can be produced from various sources, including water, natural gas, and biomass. The most common method is electrolysis, where electricity splits water into hydrogen and oxygen. As technology advances, hydrogen energy has the potential to play a significant role in reducing greenhouse gas emissions and supporting sustainable energy systems.