Card counting is simply the process of trying to gain an advantage over the casino by keeping track of the cards that have been played thus far, giving the player a better idea of the value of the cards remaining in the deck. There have been many stories circulating in the casino games world about gamblers equipped with superior mathematical skills that prey on the casinos in this manner.

While card counting is used in many other casino games, it is most commonly used in blackjack. While card counting is not generally considered illegal, many casinos do take a dim view of this practice and some gambling establishments may impose restrictions upon players whom they suspect of doing so.