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In perfumery, essential oils can be understood through top, middle, and base notes, while concentrated plant absolutes and terpenic isolates provide potent aromatic materials. Natural fixatives help slow fragrance volatility. In cosmetics, plant oils and butters act as emollients; waxes add rigidity; and botanical antioxidants, surfactants, thickeners, colorants, and soothing ingredients contribute distinct formulation functions. Food applications include volatile phytochemicals for flavor, spices and herbs with preservation and antioxidant roles, and plant-derived sweeteners and color additives. The lesson connects these examples to the ways botanical materials influence sensory qualities and product performance in several industries.