In poker, a "raise" occurs when a player increases the amount of the previous bet made during a round of betting. This can be used as a strategy to bluff or to signal strength in one's hand. The player making the raise must put in at least as much as the previous bet, and can put in more if desired. The other players must then either match the raise (by putting in the same amount) or fold (give up their hand and exit the round of betting)