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In a poker game with more than one betting round, an out is any unseen card that, if drawn, will improve a player's hand to one that is likely to win.

Knowing the number of outs a player has is an important part of poker strategy.

For example in draw poker, a hand with four diamonds has nine outs to make a flush: there are 13 diamonds in the deck, and four of them have been seen.

If a player has two small pairs, and he believes that it will be necessary for him to make a full house to win, then he has four outs: the two remaining cards of each rank that he holds.