Azobenzene is a chemical compound composed of two benzene rings connected by a nitrogen-nitrogen double bond. It is known for its ability to undergo reversible isomerization between two forms: the trans form, which is more stable, and the cis form, which is less stable. This property makes azobenzene useful in various applications, including molecular switches and photoresponsive materials. The isomerization of azobenzene can be triggered by light, specifically ultraviolet light, which causes the molecule to change shape. This characteristic has led to its use in fields such as photochemistry, nanotechnology, and drug delivery, where controlled movement or release is essential.