Blackjack has several popular variants, each with its own set of unique rules. In European Blackjack, the dealer only receives one card initially, and the second card is dealt after the player's turn. Atlantic City Blackjack is played with 8 decks and allows late surrender, with the dealer standing on 17. Vegas Strip Blackjack is played with 4 decks and gives players the option to double down on any two cards and split pairs, including aces. Spanish 21 uses a 48-card deck (with all 10s removed) and offers several bonus features, such as automatic wins for certain hands and special payouts for hands like 7-7-7. Blackjack Switch lets players switch the second card between two hands, creating more strategic options but requiring the dealer to hit on soft 17. Each of these variants offers a unique twist on the traditional game, providing different challenges and opportunities for players.