Dienes are organic compounds that contain two double bonds between carbon atoms. They can be classified into two main types: conjugated and non-conjugated. In conjugated dienes, the double bonds are separated by a single bond, allowing for unique chemical properties and stability. An example of a conjugated diene is butadiene, which is used in the production of synthetic rubber. Dienes play a significant role in various chemical reactions, such as Diels-Alder reactions, where they react with other compounds to form new structures. Their versatility makes them important in the synthesis of many natural products and industrial materials.