Bicyclopentadiene is a bicyclic organic compound with the chemical formula C₈H₈. It consists of two fused cyclopentene rings, making it a unique structure in organic chemistry. This compound is known for its reactivity and is often used as a building block in the synthesis of various chemical products. Due to its structure, bicyclopentadiene can undergo various chemical reactions, including Diels-Alder reactions, which are important in the formation of complex organic molecules. Its properties make it valuable in research and industrial applications, particularly in the field of polymer chemistry.