It uses decks of 52 cards and descends from a global family of casino banking games known as ' twenty-one'. : 342 It is the most widely played casino banking game in the world. Pontoon, twenty-one, Siebzehn und Vier, vingt-et-unīlackjack (formerly black jack and vingt-un) is a casino banking game. A blackjack example, consisting of an ace and a 10-valued card
