Counting cards is an ability that is used by players of card games to achieve a benefit by tracking cards that have been played. This provides the player a concept of the importance of cards, that need to be dealt with. Card counting is a technique that is more useful in 21 than in any other card game.

In chemin de fer, a player has an advantage when the remaining deck has "high cards." Big value cards can be faces and aces. The card counter in the casino brings into play these opportunities by placing larger wagers, as and when they happen. Several experienced gamblers use the makeup of the shoe to change their overall plan. Inexperienced players occasionally will have problems while performing quick card counting and could be prone to errors, when it comes to dealing with dealt decks of cards. Black jack card counting is an enterprise on its own. millions and millions are made or squandered, both by the gamblers and the gambling dens, depending on card counting schemes in play.

Technology has made its impact on counting cards too, with enhanced computing power affecting the complete activity. Traditional players will attest that a card counting system of greater complexity is more prone to breakdown, negating the additional accuracy enabled by the use of technology. Anyone can find many schemes for 21 card counting by visiting online resources devoted to twenty-one. With the game growing in acceptance in casinos all over the world, there are better schemes being created every other day. One can discover beyond a doubt a multitude of Web sites providing you hints on counting cards and the overall tactic to make money through vingt-et-un.