Poker is a game of chance and probability where players place bets on the strength of their cards and bluff other players. The game has a long history in American card rooms, from glitzy casinos to seedy dives, and its popularity has grown since the 1970s with the rise of the World Series of Poker. Despite the huge element of chance in every hand, successful players make quick decisions using instinct and tactics based on psychology and game theory.

Each player places an initial bet (amount varies by game) before being dealt their cards. Then, after betting rounds are completed, the highest hand wins the pot. Players can call, raise or fold their hands.

Occasionally, a player may bet all of their chips (called going “all in”). This is treated differently depending on the type of game and there are special rules for doing so.

When playing poker, good table etiquette is very important. Talking to other players at the table while they are still in a hand is generally considered bad form because it distracts them and gives away information about their hand. It is also rude to count someone’s stack, although some players do this in order to see if they can beat their opponent’s bet.

The best hand in poker is a pair of distinct cards with a high card. This is followed by a straight, flush or three of a kind. A high card also breaks ties between hands that have the same pair.