Fragrances are a blend of scented oils carried by a solvent, usually ethanol. The difference between fragrance concentrations, like eau de parfum and eau de toilette, comes down to the percentage of perfume oils in the final product.
Eau de Parfum contains around 15 to 20% perfume oils. It's a common, highly concentrated option, and most people can still detect it on their skin after a full day. "Intense" or "extreme" variations are usually still within this same range; an even more concentrated option, extrait de parfum, can hold anywhere from 20 to 40% perfume oils.
Eau de Toilette contains around 5 to 15% perfume oils. It can be a lighter and sometimes more affordable alternative to an eau de parfum in the same line, though that isn't always the case, since there's more to a fragrance than just its oil percentage.
These percentages are industry convention, so exact figures can vary slightly from one perfume house to another. In short, an eau de parfum has a greater concentration of perfume oils than an eau de toilette, even when they share the same name and the same bottle design.
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