Phenols are a class of organic compounds characterized by a hydroxyl (OH) group attached to an aromatic benzene ring. They display diverse properties, serving as antioxidants, disinfectants, and starting materials for various chemical syntheses. Natural phenols, like those found in fruits, are known for their health benefits, while synthetic phenols have applications in industries such as pharmaceuticals and cosmetics. Examples include phenol (carbolic acid) and the antioxidant resveratrol found in red wine.