Poker is a name used to describe a wide range of games that perhaps have very little in common.
Either way, action is passed on to the next player. If the previous player has chosen to check, the next player faces the same check or bet option as the previous player. If the previous player bets, the next player now has an obligation to at least match that bet if he wishes to remain eligible to win the plot. He matches the previous player's bet exactly. He wagers an amount that exceeds the bet of the previous player.