In card games, a burn card is a playing card dealt from the top of a deck, and discarded ("burned"), unused by the players. Burn cards are usually not shown to the players. Burning is most often performed in casinos to deter a form of cheating known as card marking. In poker, for example, the top card of the deck stub is burned at the beginning of each betting round, so that players who might have been able to read markings on that card during the previous round are less able to take advantage of that information. Knowledge of a burn card might be marginally useful, such as knowing there is one fewer Ace in the deck, but far less so than knowing it is about to be in play.