Poker is a series of card games that combine gambling, strategy and skill. All poker variants place bets as an intrinsic part of the game and determine the winner of each hand based on the combination of players' cards, at least some of which are hidden until the end of the hand. Poker games differ in the number of cards dealt, the number of shared or "community" cards, the number of cards that are still hidden, and the betting process.

In most modern poker games, the first round of betting begins with one or more players making some form of forced betting (blind or betting). In standard poker, each player bet on a level that they think their hand is worth more than others. The action will then proceed clockwise, as each player must match (or "follow") the largest previous bet or discard, thereby losing the bet amount to date and all other hand bets. Players who match bets can also "raise" (increase) bets. When all players make a final bet or discard, the bet round ends. If only one player discards in any turn, the remaining players will collect the bottom pool without showing their hands. If there is more than one player fighting after the last round of betting, there will be a showdown and a draw card, and then the winning hand will take the bottom pool.

In addition to the initial forced bet, only those who believe that the bet has the desired positive value or try to bluff for various strategic reasons will voluntarily put money into the pool. Therefore, although the outcome of any particular game significantly involves opportunities, players' long-term expectations depend on the actions they choose based on probability, psychology and game theory.

Since the beginning of the 20th century, the popularity of poker has increased, from the initial entertainment activities limited to group enthusiasts, to participants and audiences (including online), including many professional players and millions of dollar viewers, which has become widely popular. Prizes for the competition.