Esters of fatty acids are organic compounds formed when fatty acids react with alcohols. This reaction, known as esterification, results in the formation of an ester and water. Fatty acids are long-chain carboxylic acids, while alcohols can vary in structure, commonly being glycerol in biological systems. These esters are important in various applications, including food flavoring and fragrance. In nature, esters of fatty acids are found in fats and oils, which are essential for energy storage in living organisms. They also play a crucial role in the structure of cell membranes. Additionally, these compounds are used in the production of biodiesel, a renewable energy source derived from vegetable oils or animal fats.