Is 21 and Blackjack the same?

Blackjack and 21 refer to the same online casino game, with the same rules and final goal. In other words, “21” is another name for the classic game of blackjack, because players must get a total sum of 21 points to win. Looking at history, the game has a Spanish-French origin and was the precursor of what we know today as the American variant of blackjack.