Used in perfumery for its sweet, vanilla-like scent, coumarin is a common fragrance ingredient in soaps, cosmetics, and detergents. It serves as a precursor in the synthesis of anticoagulant drugs like warfarin. Also found in some flavorings for its pleasant aroma, its use in food is restricted in several countries due to potential liver toxicity. Coumarin derivatives are studied for their biological activities, including anti-inflammatory, antimicrobial, and anticancer properties. Additionally, it is used in dyes and as a sensitizer in solar cells.