Tetrahydrofuran (THF) is a colorless, organic compound with the chemical formula C4H8O. It is a cyclic ether commonly used as a solvent in various chemical reactions and processes. THF is known for its ability to dissolve a wide range of polar and nonpolar substances, making it valuable in industries such as pharmaceuticals and plastics. In addition to its role as a solvent, THF is also used in the production of polymers, such as polytetrahydrofuran, which is utilized in making elastic fibers. Due to its low boiling point and volatility, THF must be handled with care, as it can pose health risks if inhaled or ingested.