Acrylonitrile is a chemical compound with the formula C3H3N. It is a colorless liquid that is used primarily as a monomer in the production of synthetic fibers, plastics, and resins. Acrylonitrile is notable for its use in the manufacture of polyacrylonitrile (PAN), which is a precursor for carbon fibers, and in the production of various copolymers and plastics such as ABS (acrylonitrile butadiene styrene). It is also used in the production of certain types of rubber. The compound is classified as toxic and potentially carcinogenic, thus requiring careful handling and safety precautions during its use and processing.