RCOOR' represents an ester functional group in organic chemistry. In this notation, "R" and "R'" are hydrocarbon chains or groups, while "CO" indicates a carbonyl group (C=O) bonded to an oxygen atom (O). Esters are commonly formed through the reaction of an alcohol and a carboxylic acid, resulting in a compound that often has pleasant fruity odors. Esters are widely used in various applications, including food flavorings, fragrances, and solvents. They are also important in the production of polymers, such as polyester, which is used in textiles and packaging. Understanding esters is essential for fields like biochemistry and industrial chemistry.