In Blackjack, players aim to beat the dealer by achieving a hand value closer to 21 without exceeding it. Key gameplay elements involve being dealt two cards and having the options to hit, stand, double down, or split pairs. Variations in rules can significantly affect the game, such as whether the dealer hits on a soft 17, the number of decks used, and the payout for a natural Blackjack, which commonly ranges from 3:2 to 6:5. Additional features like surrender options and unique side bets may also be present in different versions. Understanding these rules and variations is essential for players to make informed decisions and optimize their strategies.