Definition of river
The river is the last card to be unveiled among the common cards. In total, a Hold’em-card poker player can use up to 7 cards to make his or her 5-card hand. Among the 7 cards, there will be his hole cards (2), the flop (3), the turn (1) and finally the river (1) for a total of 7. The river is preceded by the turn. After the river, for example, if one player bets and the other one calls, we will go to the showdown to reveal the hands.
River, the most expensive street
It is important to play the rivers well. You'll probably tell me that it's important to play well every streets, and you'll be right, but the reason we mention this detail is that on the river, that's when the pot will be the biggest. When a player bets 50% or 75% pot on the river, the bet itself may be 50 big blinds or more, something that is rarely seen on the flop, for example. If you make a bad call on river, it will be more expensive than if you make a bad call on flop.