Counting cards is a technique which is used by players of card games to obtain an edge by tracking cards which have been dealt. This gives the player an idea of the importance of cards, that need to be dealt with. Counting cards is a skill that has more use in 21 than in other card game.

In black jack, a gambler is at an advantage when the remaining deck houses "big value cards." Big value cards can be 10s or aces. The card counter in the gambling den takes advantage of such circumstances by laying larger bets, as and when they happen. A great many knowledgeable gamblers use the makeup of the deck to change their overall strategy. Fairly new gamblers at times have difficulty while engaged in fast card counting and may be prone to mistakes, when it comes to dealing with dealt cards. Black jack card counting is a business by itself. millions and millions are made or squandered, both by the players and the gambling dens, based on card counting strategies in use.

Computing has made its impact on card counting too, with enhanced computing power affecting the entire activity. Long-established players will attest that a card counting plan of greater complexity is more prone to problems, negating the extra accuracy allowed by the use of computers. One can find many schemes for 21 card counting by going internet resources devoted to the game. With the game increasing in popularity in gambling dens around the world, there are newer strategies coming up every other day. One can find easily hundreds of internet sites giving you tips on counting cards and the across the board tactic to make cash playing 21.