Then tell me what it is and explain to me why Creationists favor it so over evolution?
ID is the theory that life is too complex to have occurred by random mutation. It only says life was intelligently designed, it does not address who that designer was. Evidence of the complexity of life is presented, as well as information relating to how such complexity could not have arisen by chance.
Creationism says that God created the universe pretty much as it is now. It also says who the Creator is.
Natually, Creationists would favor ID over evolution, because Creationists believe in a Creator. Evolution says "This all happened by random chance."