Fragrance oils are synthetic and natural aromatic compounds used to scent soaps, providing a wide variety of scents beyond what's achievable with essential oils alone. They are Phthalate free and generally safe for skin when properly diluted and integrated into soap. Popular fragrance oils for soap making include those inspired by popular perfumes, fruits, and classic scents. Many are dupes of famous scents by Victoria's Secret, Bath Body Works, Chanel, Versace, Dior, etc.