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In baseball, a walk-off home run is a home run that ends the game. It must be a home run that gives the home team the lead (and consequently, the win) in the bottom of the final inning of the game. Thus the home team can walk off the field immediately afterward, rather than finishing the inning. The winning runs must still be counted at home plate.
If the home team hits a home run to win the game in the 9th or an extra inning, both teams walk off the field since the game is over.   Answer     A walk-off home run is a home run in the bottom of the last inning that ends the game.