Perfume, Eau de Parfum, Eau de Toilette, and Eau de Cologne are all fragrances.
The differences are different levels of fragrance oils concentrated in each. These oils are sometimes called "fragrance juice or just juice." perfume (or parfum) contains the highest concentration of the fragrance juice. Followed by Eau de Parfum, then Eau de Toilette, and finally Eau de Cologne.
Eau de Toilette and Eau de Cologne are most times interchangeable, especially in Men's fragrances. After Shave has the least amount of oils. The higher the concentration of "juice" the longer your fragrance will last, and the less you need to apply your fragrance to your body.
People with dry skin usually find their fragrance holding time shorter than those with oily skin because oily skin has more natural moisture to hold in the fragrance.
WHERE TO APPLY YOUR FRAGRANCE
You should apply your fragrance low on the body, apply your fragrance behind your ears and on your neck, so as to ensure that the scent rises and you won't lose it as quickly. A light spray on the hair is also good as that may prolong the fragrant effect all day.
ALCOHOL IN FRAGRANCES
Alcohol in fragrances helps the fragrance effuse your body. Without alcohol, you would be the only person who knew you were wearing any fragrance at all because no one would perceive it as it will remain where you have applied it.
Fragrances hold different scents, these scents are called "notes." These notes are three types and each execute different features at different times. They are top notes or head notes, middle notes and bottom notes.
Top notes are light and last just a few minutes say (5-10 minutes). Middle notes become apparent in about 15 minutes after application. These can last up to an hour or more. Bottom notes carry heavier ingredients. These last the longest, usually for several hours.