Card counting is a skill that is used by players of card games to gain an advantage by following cards that have been used. This provides the player a concept of the importance of cards, that have to be dealt with. Counting cards is a skill that has more use in black jack than in any other card game.

In vingt-et-un, a player is at an advantage when the remaining deck has "big value cards." Big value cards should be 10s or aces. The counter in the gambling den takes advantage of such situations by laying larger wagers, as and when they occur. A good many skillful gamblers use the makeup of the shoe to change their overall plan. New gamblers occasionally have problems while trying fast counting and could be prone to mistakes, when it comes to dealing with dealt cards. Vingt-et-un card counting is an industry on its own. huge amounts of money are made or spent, by both the players and the gambling dens, based on card counting methods in use.

Computing has made its presence known on counting cards too, with enhanced computing power impacting the entire activity. Long-standing gamblers however vow that a card counting plan of greater complexity is more subject to breakdown, evening out the increased accuracy enabled by the use of technology. One can dig up many strategies for twenty-one card counting by going net pages dedicated to the game. With the game increasing in fame in gambling dens around the planet, there are newer game plans being created every other day. One can find easily a multitude of internet pages giving you tricks on counting cards and the across the board scheme to make profit through twenty-one.