What does eau de mean in perfume?

To maximize the shelf life of an eau de parfum or an eau de toilette, Slatkin recommends keeping it in a cool, dry, and dark place. To maximize the shelf life of an eau de parfum or an eau de toilette, Slatkin recommends keeping it in a cool, dry, and dark place. The exact composition varies by brand, but it’s safe to consider an eau de toilette lighter and fresher, says Eduardo Valadez. Rich, full-bodied eau de parfums go well with evening activities and colder climates, as the scent evaporates faster when the air is dry. You therefore need a higher scent concentration to

achieve the same scent effect.

Eau de toilette have a relatively light spray composition that consists of 5 to 15 percent pure perfume essence dissolved in alcohol.

References:

• Eau de toilette – Wikipedia
• https://www.southernliving.com/fashion-beauty/difference-between-types-of-fragrances-explained