If all but one player folds on any round, the remaining player collects the pot without being required to reveal their hand. The betting round ends when all players have either called the last bet or folded. A player who matches a bet may also 'raise' (increase) the bet. The action then proceeds clockwise as each player in turn must either match (or 'call') the maximum previous bet, or fold, losing the amount bet so far and all further involvement in the hand. In standard poker, each player bets according to the rank they believe their hand is worth as compared to the other players. In most modern poker games, the first round of betting begins with one or more of the players making some form of a forced bet (the blind or ante). Poker games vary in the number of cards dealt, the number of shared or 'community' cards, the number of cards that remain hidden, and the betting procedures. All poker variants involve betting as an intrinsic part of play, and determine the winner of each hand according to the combinations of players' cards, at least some of which remain hidden until the end of the hand. Poker is a family of card games that combines gambling, strategy, and skill.