The chemical element with the symbol "H" is hydrogen. It is the simplest and most abundant element in the universe, primarily found in stars, including our Sun, where it undergoes fusion to produce helium and significant amounts of energy. Hydrogen plays a critical role in various chemical reactions, particularly in the formation of water (H₂O) when it combines with oxygen. It is also a key component of organic compounds and fuels, making it essential for life as well as critical in various industrial applications, including the production of fertilizers and clean energy solutions like hydrogen fuel cells.