A example highlighting the essence of a Concept Job Description
Magic is integral to being a witch, you can be a witch without your hat or your robes, but you cannot be a witch if you don’t have magic. Magic is an integral feature of being a witch.
Whales, however were commonly thought to be just big fish. Later, it turns out that whales are mammals not fish! However, our understanding of the existance of whales did not change. This is because being a big fish is not an essential feature of being a whale.