Counting cards is a technique that is employed by players of card games to achieve an advantage by following cards which have been dealt. This gives the player a concept of the importance of cards, that need to be dealt with. Counting cards is a technique that is more advantageous in twenty-one than in other card game.

In twenty-one, a gambler is at an advantage when the remaining shoe has "big value cards." Big value cards can be faces and aces. The card counter in the casino brings into play such circumstances by placing bigger bets, as and when they happen. Many knowledgeable players use the makeup of the deck to adjust their overall plan. Amateur players occasionally have difficulty while trying quick card counting and may be prone to mistakes, when it comes to working with dealt cards. Black jack card counting is an industry on its own. millions and millions are won or spent, by both the players and the gambling dens, depending on card counting schemes in play.

Computing has made its impact on card counting too, with improved computing power affecting the complete process. Traditional players will argue that a card counting scheme of greater complexity is more subject to error, canceling out the increased accuracy enabled by the use of technology. Anyone can find many techniques for vingt-et-un card counting by visiting online sites dedicated to the game. With the game increasing in popularity in gambling halls all over the world, there are newer strategies coming up every other day. One can discover literally hundreds of Web pages giving you tricks on card counting and the across the board scheme to earn cash through blackjack.