Dicarboxylic acids are organic compounds that contain two carboxyl functional groups (-COOH) in their molecular structure. These acids can be found in various natural sources, such as plants and animal tissues, and are important in many biological processes. Common examples include oxalic acid, succinic acid, and adipic acid. These acids play a significant role in the production of polymers, pharmaceuticals, and food additives. They can be synthesized through various chemical reactions, including oxidation of alcohols or aldehydes. Dicarboxylic acids are also used in the manufacture of plastics, resins, and other industrial materials.