BH3, or borane, is a chemical compound consisting of one boron atom and three hydrogen atoms. It is a colorless gas at room temperature and is known for its strong reducing properties. BH3 is often used in organic chemistry as a reagent for various reactions, including the reduction of carbonyl compounds. In addition to its use in laboratories, BH3 can also form complexes with other molecules, enhancing its reactivity. It is important in the synthesis of certain organic compounds and plays a role in the development of boron-containing compounds used in pharmaceuticals and materials science.