If you have a strong hand with the potential to make an even better one, you have a redraw.
For example, if you have KsJs on As Qd Ts, you have a straight and a redraw to flush and even royal flush, for that matter. If your opponent is also holding a straight, you are free rolling since you are guaranteed to at least split the pot, but you will take it all down if another spade comes on the turn or river.
Such a hand has more equity than the one without the potential to improve, so it will win you some huge pots over your career. In a situation where you can expect your opponent to also have nuts without a redraw potential, you can even significantly over bet the pot and put all your money in the middle since he is not going to fold, and you want to maximize your EV in this amazing situation.