Counting cards is a technique that is employed by gamblers of card games to realize an advantage by following cards that have been used. This gives the player an idea of the sum of cards, which need to be dealt with. Counting cards is an ability that has more use in chemin de fer than in other card game.

In twenty-one, a player is at an advantage when the remaining deck contains "high cards." High cards could be faces and aces. The card counter in the casino takes advantage of these opportunities by placing larger bets, as and when they happen. Most knowledgeable players use the makeup of the shoe to change their overall plan. New gamblers sometimes experience problems while trying rapid counting and may be prone to mistakes, when it comes to dealing with dealt decks. Black jack card counting is a business by itself. Millions are won or squandered, both by the gamblers and the gambling dens, depending on card counting techniques in use.

Technology has made its presence known on card counting too, with refined computing power affecting the entire process. Old guard players however argue that a more complex card counting approach is more subject to breakdown, evening out the added accuracy permitted by the application of computers. Anyone can dig up many game plans for twenty-one card counting by visiting online resources devoted to black jack. With the game growing in acceptance in gambling dens all over the globe, there are better tactics being created every other day. One can dig up easily a multitude of Web sites sharing with you hints on counting cards and the overall strategy to earn money playing blackjack.