Poker is a card game where players place bets against one another based on the value of their hand. It can be played with either real money or chips (small plastic or ceramic tokens that represent cash). The player who puts the most chips into the pot wins the round and all of the money in the pot.
In a standard game of poker, each player is dealt five cards. There are three betting rounds, and each betting round reveals an additional card to the table. The final community card revealed in the final betting round is known as the river.
Generally speaking, the highest-ranked hands win in poker. Exceptions can be made for certain hands that are easy to conceal. For example, if you have pocket fives and the flop comes A-8-5 then people will be very hesitant to call your bet on this hand as it looks like a straight to them.
The rank of a poker hand is determined by its odds (probability). There are four suits: spades, hearts, diamonds and clubs; and the Ace can be high or low. Unlike the rank of a suit, the rank of a poker hand is not dependent on its order of cards; however, some poker variants may use wild cards to change this relationship.
Some poker variants require a player to make a blind bet before the players are dealt their cards. This is usually a requirement that is rotated around the table in turn, and it allows players to choose whether or not to open the betting.