Card counting is an ability that is used by players of card games to obtain an edge by tracking cards which have been used. This gives the player a notion of the value of cards, which have to be dealt with. Counting cards is an ability that is more beneficial in twenty-one than in any other card game.

In 21, a gambler is at an advantage when the remaining deck houses "high cards." High cards could be faces and aces. The counter in the casino takes advantage of these circumstances by placing greater bets, as and when they happen. Several adept players use the composition of the deck to change their overall strategy. New players sometimes experience difficulty while trying quick card counting and might be subject to errors, when it comes to handling dealt decks of cards. 21 card counting is an industry by itself. massive amounts of money are won or squandered, by both the players and the gambling halls, based on card counting techniques in play.

Technology has made its impact on card counting too, with improved computing power affecting the complete process. Traditional gamblers will argue that a card counting plan of greater complexity is more prone to breakdown, negating the added accuracy allowed by the use of technology. Anyone can find a lot of plans for blackjack card counting by visiting net sites dedicated to vingt-et-un. With the game increasing in acceptance in casinos around the globe, there are newer tactics being created every other day. One can dig up easily thousands of internet pages providing you tips on counting cards and the all-around tactic to make profit through vingt-et-un.