Polyacrylonitrile (PAN) is a synthetic polymer made from the polymerization of acrylonitrile monomers. It is known for its high strength, thermal stability, and resistance to chemicals, making it useful in various applications, including textiles, carbon fibers, and coatings. PAN is often used as a precursor for producing carbon fibers, which are lightweight and strong materials used in aerospace, automotive, and sporting goods. Additionally, PAN can be found in applications such as filtration membranes and as a component in certain types of plastics, contributing to its versatility in industrial uses.