Poker is a family of card games where players bet which is the best hand according to the rules of a particular game in ways like these scales. While the oldest known type of game was played with only 20 cards, today it is usually played with a standard deck, although in countries where shortcuts are common, it may play with 32, 40 or 48 cards. Poker games, therefore, vary in the configuration of the desk, the number of playing cards, the number of ups and downs, and the number shared by all players, but they all have rules that include one or more betting rounds.