How do you double and redouble in contract bridge the card game?

In contract bridge, doubling occurs when a player believes their opponents will fail to make their bid, increasing the stakes for that hand. The opponents can then choose to redouble if they feel confident in their ability to make the bid, further raising the stakes. A double or redouble affects the scoring, potentially yielding higher points for both the doubling side if they win and higher penalties for the opponents if they fail to make their contract. It's a strategic move that can significantly impact the outcome of the game.