Poker is a family of comparing card games in which players wager over which hand is best according to that specific
game's rules. It is played worldwide, but in some places the rules may vary. While the earliest known form of the game
was played with just 20 cards, today it is usually played with a standard deck, although in countries where short packs
are common, it may be played with 32, 40 or 48 cards.
Thus poker games vary in deck configuration, the number of cards in play, the number dealt face up or face down, and the number shared by all players, but all have rules that
involve one or more rounds of betting.