What is the difference between coty wild musk oil and coty wild musk oil perfume?

There are 3 basic types of fragrance which are really just 3 different levels of potency. Oil is the strongest, also called essence. eau de parfum is the next strongest which is what good perfume is. The weakest is eau de toilette. Personally I stay away from eau de toilette because it wears off quickly and you have to use more of it.