2-Nonenoic acid is primarily used in the flavor and fragrance industry due to its unique odor profile. It imparts a green, fatty, and slightly citrus-like scent, making it a valuable component in the formulation of perfumes, colognes, and other scented products. Additionally, it is employed in the creation of synthetic flavors, particularly in food products where a fresh, green note is desired. Its application extends to the production of soaps, detergents, and cosmetics, where it enhances the overall sensory experience. The compound also finds use in organic synthesis as an intermediate for the preparation of more complex chemical structures.