Poker is a popular card game where players compete against each other to win the pot. In poker, the worst hand is considered to be a 'high card' hand, where all five cards are of different rank and are not part of a flush or straight. This hand is also known as 'one pair' and has very little chance of winning the pot when compared to other hands such as a flush or a straight. Additionally, the high card hand has very little value in a game with multiple players, as it is easy to be beaten by another player with a better hand. Therefore, it is important for players to not rely too heavily on a high card hand when playing poker.