Aromatic compounds are a class of organic molecules characterized by the presence of a stable ring structure with alternating double bonds, known as an aromatic ring or benzene ring. This structure follows Hückel's rule, which states that aromatic rings have $4n+2$ π electrons, making them highly stable and less reactive than other unsaturated compounds. Aromatic compounds are commonly found in natural products, pharmaceuticals, and dyes due to their stability and unique chemical properties.