Carboxylic acids are organic compounds that contain a carboxyl group, which is made up of a carbon atom double-bonded to an oxygen atom and single-bonded to a hydroxyl group (-COOH). This functional group gives carboxylic acids their acidic properties, allowing them to donate protons in chemical reactions. Common examples include acetic acid, found in vinegar, and citric acid, present in citrus fruits. These acids are important in various biological and industrial processes. They play a key role in metabolism and are used in the production of polymers, food additives, and pharmaceuticals. Their unique properties make them essential in both nature and technology.