Counting cards is an ability that is used by gamblers of card games to obtain a benefit by tracking cards that have been used. This provides the gambler an idea of the value of cards, which need to be dealt with. Counting cards is a technique that has more use in 21 than in other card game.

In vingt-et-un, a gambler is at an advantage when the remaining deck has "high cards." High cards can be faces and aces. The card counter in the gambling den brings into play these situations by placing bigger bets, as and when they occur. Most experienced gamblers use the composition of the deck to change their overall plan. Inexperienced gamblers on occasion experience problems while trying fast counting and may be subject to mistakes, when it comes to dealing with dealt decks of cards. 21 card counting is an enterprise by itself. huge amounts of money are won or spent, both by the players and the gambling dens, based on card counting schemes in play.

Computing has made its impact on counting cards too, with refined devices impacting the entire process. Long-established gamblers however swear that a card counting plan of greater complexity is more subject to blunders, negating the added accuracy allowed by the use of computers. Anyone can locate a lot of game plans for black jack card counting by going online sites committed to the game. With the game growing in popularity in gambling dens all over the globe, there are better techniques coming up every other day. One can locate literally a multitude of Web pages providing you ways on counting cards and the overall strategy to make profit playing vingt-et-un.