Poker is a card game in which players bet on the chances of having the best hand. The amount of money placed into the pot is determined by the action of players, which may be based on chance but must also take into account their knowledge of probability, psychology and game theory. The game can be played by two or more people and may be a stand-alone event or part of a larger tournament.

There are many different poker games and rules, but most share the same general features. Each player is dealt five cards. The best five-card hand wins the pot. If the best hand is not made, the pot is shared among those who have a better hand. In some games, a single player may win all of the chips that were put down as buy-ins at the table.

A player can call (match) a bet, raise it or fold. A player who raises can continue raising until he or she has not called every bet in the round, at which point the betting interval is over. Usually there are multiple betting intervals in a Poker deal, but sometimes there is a single betting interval.

While luck does play a large role in the outcome of any individual hand, professional players understand that there is a certain degree of skill involved in the game. By carefully analyzing the probability of their own hand and the probabilities of other hands, they are able to make educated decisions about when to fold and when to call.