Perfume is not only “water with unique smell”, it has differences according to the level of smell, function, and price. But ultimately, the key of it is how much the fragrance concentrate in each contains.
Here are some examples.
Extract or Extrait Perfume: contains highest percentage of perfume concentrate about 15%-40%, and it lasts the longest time when compare with other types.
Eau de parfum: it is the most popular and common type which contains 7%-15%, and cost less than perfume.
Eau de toilette, or EDT: it has less potent and only has 1%-6% perfume concentrate, so it lasts shorter and has less scents.
Eau de cologne: it is similar with Eau de toilette, but the differences is that Eau de cologne has a combination of citrus oils and fragrance, which is usually used for Napoleon.
Body splash (Figure2): it has the least potent and perfume content, lasts the shortest time, and you may use it several times per day but it is very cheap.