A "walk-off home run" is a term used in baseball to describe a situation where a player hits a home run in the final inning of a game, allowing their team to win immediately. This dramatic moment occurs when the home run gives the batting team a lead that surpasses the opposing team's score, resulting in the game ending right then and there. When a player hits a walk-off home run, the game concludes with the player and their teammates celebrating on the field. This type of play is often memorable and exciting for fans, as it showcases the player's ability to perform under pressure and can lead to thrilling moments in Major League Baseball history.