Poker is a card game played by two or more players. It can be a game of chance or it can involve considerable skill and psychology (it is important to separate luck from skill though). The game is typically played with a standard pack of 52 cards; each player is dealt 5 cards. There are four suits (spades, hearts, diamonds and clubs), and each suit has a different rank.
In most games players must ante some amount of money (the exact amount varies by game). Then they will be dealt cards and then bet into a pot in the middle. At the end of a betting round the highest hand wins the pot.
When a player has an inferior hand he may choose to bluff. In fact good bluffing can win a bad poker hand a lot of money.
After the first betting round is over the dealer deals three additional cards face up on the table. These are called the flop. This will start a second betting round.
Once the second betting round is over the dealer puts another card face up on the board, this time it is a community card. There will be a third betting round. Afterwards the final card will be revealed. The fourth and last betting round is the River. The highest poker hand will win the pot.