Why is there such thing as money?

I dont really have an explination for this question, but in some terms, its actually a great question, I mean really, what is the point of it? We could be like the Native American Tribes, we can trade things, well no, not really, because thats about the same as paying for it, but its better to do that in my opinion.

Anyway, I’ve always just been wondering, what seriously is the point of money, we dont really need it do we?