Running It Twice
In some cash games, if a player is all in before the river has been dealt, the players involved can agree to "run it twice" which means dealing the remaining streets two times, with half the pot in each instance going to the player making the best hand. (Players can also "run it" more than twice by having the remaining cards dealt more times, if they wish and the game allows it.)
For example, a player with A♣K♦ goes all in and gets called by another with Q♦Q♣, and they agree to run it twice. The first board is dealt and comes 2♦8♠K♥9♣8♠, meaning the first player wins with kings, then the second comes 9♥3♦3♣J♥7♦, meaning the second player wins with queens. The two players split the pot, each winning half.