Whenever discussing the Chosen One and the Prophecy, the balance of the Force usually comes up.

I know Anakin destroyed the sith and brought the Force back into balance, but how so???
I mean, wouldn't it be balanced if both sides were intact? Perhaps they were reffereing to the balance of conflict, meaning with out the dark side, the always present teetering of good and bad would somewhat be demolished.

But that just doesn't seem like balance to me. Like the the Symbol Ying-Yang. You have to have the Ying in coordination with the Yang. (lol, if that makes sense) They exist through support of each other, the balance of forces, but that is beside the point.

Can anybody explain?