In baseball, the term "walk-off" refers to a situation where a team wins the game in the last inning with a hit that allows the winning run to score, thus "walking off" the field as victors. A walk-off hit can be a home run, a single, or any play that brings in the decisive run, creating a highly emotional moment for players and fans alike. This term emphasizes the dramatic conclusion to a game, showcasing the thrill and unpredictability of baseball.