Poker is a family of card games where players bet on whether or not they have the best hand according to the rules of the game. It is played worldwide and can be enjoyed in casinos, community card games, and at home.

Various variants of poker are available, each with their own set of rules and specific strategies for winning. All poker variants share some fundamental features, such as the ranking of hands based on one or more cards of each rank and a mathematical inverse relationship between hand value and frequency of occurrence.

1. Straight: A straight in a game of poker is the highest hand possible, made by three cards of each suit and one card of any other rank. This is the most common type of hand in most games.

2. Pair: A pair is a pair of two identical cards. This is often the highest possible hand in a poker hand, especially when two cards of each rank remain after the deal.

3. Low: A low hand in a poker hand is a hand with a lower ranking than the high-ranking cards. The lowest hand in a poker hand is a single low card, such as two sixes.

4. Aces: The ace is the highest-ranking card in a poker hand and is worth the most. The king, queen, and jack are the other three high-ranking cards in a poker hand.

5. Draw: A draw in a game of poker is when the dealer distributes four or more cards face up to the players and they create a hand using these cards as well as the original hand they were dealt.