Poker is a card game where players bet on the strength of their cards and compete against others to win a pot of chips. It is a popular game played in casinos and on the internet.

Rules vary by variant, but a basic game usually has one or more betting intervals. During a betting interval, each player in turn must make a bet of at least as many chips as the previous player, or drop out. When all bets have been made, the betting period ends.

A poker hand comprises five cards, with the value in inverse proportion to their mathematical frequency; that is, the more unusual the combination of cards, the higher the hand ranks. The standard hands are a straight, a flush, and three of a kind.

Bluffing is a skill used in Poker. It is a technique used to hide the strength of an opponent’s hand and to deceive other players into believing that a player has a superior hand.

Tightness is a measure of the tightness of a poker player’s play, one minus the proportion of hands in which a player voluntarily wagered money in the first betting round (“called or raised before the flop”). It is thought that tighter players tend to be better players and are more likely to win.

The term “poker” comes from the French word poque (to knock), which is believed to have come from a German version of the game and to have been introduced by French settlers in New Orleans. The name of the game is also said to have descended from a Persian game and to share ancestry with the Renaissance game primero and the French brelan.