Diazonium salts are a group of Organic Compounds characterized by the presence of the Diazonium functional group, -N2+X-, where X is an anion. They are Highly reactive intermediates used in Organic Synthesis, particularly in the formation of Azo Dyes and in the Sandmeyer Reaction for the Introduction of halogens, Hydroxyl Groups, and other Substituents into aromatic rings.