Eau de toilette, eau de parfum, and parfum differ in their concentration of perfume oil, which affects their strength and lasting power. Eau de parfum contains 15-20% perfume oil, making it richer and longer-lasting, while eau de toilette contains 10-15% perfume oil, making it lighter and fresher. Parfum, also known as perfume, has the highest concentration of perfume oil, typically ranging from 15-40%, making it the most potent and long-lasting. The higher the concentration of perfume oil, the stronger and more long-lasting the fragrance. Eau de toilette is suitable for casual daywear, eau de parfum for day or evening wear, and parfum for special occasions or evening wear

. The choice between them depends on personal preference and the desired intensity and lasting power of the fragrance.