No, blackjack is not the same as 21 though there are some similarities in how the games are played. The game of 21 is a precursor of the modern blackjack. The main difference between blackjack and twenty-one is that in blackjack, the player is playing against the dealer. The player wins if the wager does not exceed 21 or is higher than the dealer’s total or if the dealer goes over 21. In Twenty One, on the contrary, a player is playing against both the dealer and the other players at the table.