They are vitamins. Your body cannot make them. But they spoil easily. Butter is far, far better than margarine or shortening. And it tastes better.
Unrefined oils are delicious.
We have been tricked into thinking that seed oils should not have taste. Take flax seed oil daily. Buy in small quantities so that its always fresh. Spoiled flax tastes dreadful. Those found in some margarines, shortening, partially hydrogenated vegetable oils.