Original: Poker games differ in how the cards are dealt , how hands may be formed , whether the high or low hand wins the pot in a showdown ( in some games , the pot is split between the high and low hands ) , limits on bets and how many rounds of betting are allowed .
Simplified: In a casino a '' house '' dealer handles the cards for each hand , but a button ( any small item used as a marker , also called a buck ) is rotated among the players to determine the order of dealing and betting in certain games .