Aromatic compounds are organic compounds that contain one or more benzene rings or other ring systems that exhibit similar chemical behavior. These compounds are characterized by their distinctive, pleasant odors or aromas, which gave them their name.

The most common aromatic compound is benzene, which consists of a six-carbon ring with alternating double bonds. Aromatic compounds are known for their unique properties, including high stability, resonance, and delocalization of electrons.

They are widely used in various fields such as pharmaceuticals, agrochemicals, dyes, fragrances, and polymers. They also play a crucial role in biological systems, including DNA, enzymes, and neurotransmitters.

Aromatic compounds can undergo various reactions such as substitution, addition, and oxidation. Aromatic substitution reactions are the most common and involve the replacement of one or more hydrogen atoms in the ring with a substituent.