Poker is a card game in which players bet into a poker pot during the course of a hand. The poker player holding the best hand at the end of the betting wins the pot. During a given betting round, each remaining player in turn may take one of four actions: check, bet or raise, call, fold. Poker betting usually proceeds in a circle until each player has either called all bets or folded. Different poker games have various numbers of betting rounds interspersed with the receipt or replacement of cards. Poker is usually played with a standard 4-suit 52-card deck. In some poker games a joker or other wild cards may be added. The ace normally plays high, but can sometimes play low.