3-Octen-2-one is primarily used as a flavor and fragrance additive due to its characteristic mushroom-like, earthy, green, and slightly metallic aroma. It is commonly found in food products to enhance savory, fungal, or green vegetable notes, such as in mushroom flavors or natural earthy profiles. Also utilized in perfumery for adding depth with soil-like, fresh green, or herbal nuances to fragrance compositions. Its potent odor makes it effective at low concentrations in both consumer and industrial applications.