Blackjack originated from the French game Vingt-et-Un, which aimed for a total of 21. It made its way to the United States in the 19th century and gained popularity in gambling halls, particularly in Las Vegas. To attract players, casinos introduced variations and bonuses, such as the special payout for a "blackjack." Standardized rules emerged, along with innovations like doubling down and splitting pairs. The game saw a significant shift in the mid-20th century with the rise of card counting strategies, influencing casino dynamics and player tactics. In recent years, the advent of online gambling has further transformed blackjack, offering various digital formats and maintaining its status as a popular and engaging game.