Coumarin is widely used in the fragrance and flavoring industries due to its sweet, pleasant aroma reminiscent of vanilla or freshly cut hay. It is a key ingredient in perfumes, soaps, and detergents, providing a rich, warm scent. In the food industry, it is used as a flavoring agent in certain foods and beverages, such as alcoholic drinks, baked goods, and confectionery, although its use is regulated in many countries due to potential health concerns.

In addition to its role in fragrances and flavors, coumarin has applications in the pharmaceutical industry. It serves as a precursor for the synthesis of anticoagulant drugs, such as warfarin, which are used to prevent blood clots. Coumarin derivatives are also being explored for their potential anti-inflammatory, antioxidant, and anticancer properties in medical research.

In agriculture, coumarin is sometimes used as a natural pesticide due to its ability to deter insects and pests. It is also found in some plant species, where it acts as a defense mechanism against herbivores.

Overall, coumarin’s versatility makes it valuable across various industries, though its use is often carefully controlled to ensure safety.