Blackjack (also known as 21) is the most popular card game, making it the number one game to play in casinos the world over. Upon first arriving in the United States, Blackjack didn’t quite stick with gamblers right away, but through cunning use of different bonuses and payouts, it began to catch on among gamblers everywhere. Blackjack’s predecessor was a game named Vingt-et-un, a game from 16th Century France.