In the game of poker, the play largely centers on the act of betting, and as such, a protocol has been developed to speed up play, lessen confusion, and increase security while playing. Different games are played using different types of bets, and small variations in etiquette exist between cardrooms, but for the most part the following rules and protocol are observed by the majority of poker players.
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Blinds are forced bets posted by players to the left of the dealer button in flop-style poker games. The number of blinds is usually two, but it can range from none to three. When there are two blinds they are called the small blind and the big blind.
Poker is a family of comparing card games in which players wager over which hand is best according to that specific game's rules. It is played worldwide, with varying rules in different places. While the earliest known form of the game was played with just 20 cards, today it is usually played with a standard 52-card deck, although in countries where short packs are common, it may be played with 32, 40 or 48 cards. Thus poker games vary in deck configuration, the number of cards in play, the number dealt face up or face down and the number shared by all players, but all have rules that involve one or more rounds of betting.
In most modern poker games, the first round of betting begins with one or more of the players making some form of a forced bet (the blind or ante). In standard poker, each player bets according to the rank they believe their hand is worth as compared to the other players. The action then proceeds clockwise as each player in turn must either match (or "call") the maximum previous bet, or fold, losing the amount bet so far and all further involvement in the hand. A player who matches a bet may also "raise" (increase) the bet. The betting round ends when all players have either called the last bet or folded. If all but one player folds on any round, the remaining player collects the pot without being required to reveal their hand. If more than one player remains in contention after the final betting round, a showdown takes place where the hands are revealed, and the player with the winning hand takes the pot.
Community card poker is any game of poker that uses community cards (also called "shared cards"), which are cards dealt face up in the center of the table and shared by all players. In these games, each player is dealt an incomplete hand face down ("hole cards"), which are then combined with the community cards to make a complete hand. The set of community cards is called the "board", and may be dealt in a simple line or arranged in a special pattern. Rules of each game determine how they may be combined with each player's private hand. The most popular community card game today is Texas hold 'em, originating sometime in the 1920s.
In home games, it is typical to use antes, while casinos typically use only blinds for these games. No limit and fixed limit games are most common, while spread limit and pot limit games are less common. The betting format and stakes can vary by region as well as time of year and volume (casinos often change games on weekends to accommodate increased customer demand). Later betting rounds often have a higher limit than earlier betting rounds. Each betting round begins with the player to the dealer's left (when blinds are used, the first round begins with the player after the big blind), so community card games are generally positional games.