This article is about the gambling game. For the variant of Hearts called Black Jack, see Black Jack (Hearts). For the shedding-type card game sometimes called Black Jack, see Black Jack (Switch). For other uses, see Black Jack.

Blackjack (formerly black jack and vingt-un) is a casino banking game.[1]: 342  It is the most widely played casino banking game in the world. It uses decks of 52 cards and descends from a global family of casino banking games known as "twenty-one". This family of card games also includes the European games vingt-et-un and pontoon, and the Russian game Ochko [ru].[2] Blackjack players do not compete against each other. The game is a comparing card game where each player competes against the dealer.