What is the difference between a cultivar and a variety?

A variety can be found growing & reproducing naturally. A cultivar is a cultivated variety that is the result of human intervention. 

Ifound this on google “aristotle (384–322 bc) in western scientific taxonomy the greek philosopher aristotle was the first to classify all living things, and some of his groups are still used today, like the vertebrates and invertebrates, which he called animals with blood and without blood.” i hope this you for what your looking for.