Blackjack, also known as Twenty-one or Vingt-et-un (French for "twenty-one"), is a comparing-type card game which is the most widely played casino banking game in the world. The standard game is played with one or more Anglo-American decks  of 52 cards. The player draws cards to an initial two card hand with the object of bringing the total hand value as close as possible to 21 without exceeding it, so that the house, which plays after the player, will fail to get up to the player's total, or will lose by exceeding 21.

Blackjack is played in many variations at casinos with different table rules. Much of blackjack's popularity is due to the mix of chance, skill, and the publicity that surrounds card counting, which entails adapting one's wager and playing strategy to the profile of cards yet to be dealt.

Blackjack is closely related to the games of Spanish 21 and Pontoon, but unrelated to the British game with the similar name Black Jack which is a shedding-type card game.

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