In baseball, the immediate victory achieved by the home team when it is trailing or tied with the visiting team and scores a run during the bottom half of the 9th inning or later.
Most baseball games conclude in the 9th inning, either with the home team or the visiting team in the lead. A "walk-off" occurs when the game is tied, or the visiting team has the lead and the home team takes the lead during the 9th inning or later. The game is immediately over and the home team wins. The term "walk-off" refers to the immediacy of the game's conclusion, as the winning team can simply walk off the field as soon as the winning run is scored.