Arenes, also known as aromatic hydrocarbons, are a class of organic compounds that contain one or more benzene rings. These rings are characterized by their stable structure, which includes alternating double bonds. This unique arrangement allows arenes to exhibit distinct chemical properties, such as a tendency to undergo substitution reactions rather than addition reactions. Common examples of arenes include toluene and naphthalene. Arenes are widely used in various industries, including the production of dyes, plastics, and pharmaceuticals. Their stability and reactivity make them important in both chemical research and practical applications.