Aromatic hydrocarbons are a special class of organic compounds that contain one or more benzene rings in their structure. These rings are made up of carbon atoms arranged in a hexagonal shape, with alternating double bonds, giving them unique stability and chemical properties. Common examples of aromatic hydrocarbons include toluene and naphthalene, which are often found in products like paints and mothballs. These compounds are known for their distinct scents, which is where the term "aromatic" comes from. Aromatic hydrocarbons play important roles in various industries, including petrochemicals and pharmaceuticals, but they can also pose health risks due to their potential toxicity and environmental impact.