Creation is the belief that God created everything, all the world in 6 days. He created water, earth, other planets, the universe, people, pretty much everything that ever existed he created. He called light day, and dark night. On the 7th day it was a resting day, which is a Sunday.
Evolution is a belief that everything was created somehow. A widely held notion that all life is related and has descended from a common ancestor. For example the birds and the bananas, the fishes and the flowers are all related.
I believe in evolution because I think that all the world was created somehow someway, by something else.