Full explanation — All-In
Going all-in means betting the entirety of your remaining chip stack in one move. An all-in player cannot be forced out of the hand and always sees it through to showdown, even if others keep betting more than they have. When an all-in bet does not cover the full amount other players want to wager, a side pot is created for the remaining chips among the players who still have money behind, while the all-in player can only win up to the main pot.