Blackjack, commonly referred to as 21 in casinos, is a very well-liked card game. Having a hand value that is closer to 21 than the dealer's hand withouteen patti yonot going over 21 is the goal of beating the dealer. Not each other, but the dealer is the rival among the players. One or more standard 52-card decks are used in the game. Face cards (kings, queens, & jacks) are worth 10, while aces can be worth 1 or 11, depending on which is best for the player's hand.