Trans-2-octenoic acid is primarily used in the flavor and fragrance industry due to its ability to impart a fresh, green, and slightly fatty aroma. It is often incorporated into food products to enhance or mimic natural flavors, particularly in dairy, fruit, and vegetable-based items. Additionally, it serves as a key intermediate in the synthesis of other flavor compounds and aroma chemicals. In cosmetics and personal care products, it is utilized to add a subtle, pleasant scent to formulations such as lotions, creams, and perfumes. Its antimicrobial properties also make it a potential candidate for use in preservative systems, though this application is less common.