In baseball, a walk-off home run is a home run that ens the game. It must be a home run that gives the home team the lead in the bottom of the final inning of the game — either the ninth inning, or any extra inning, or any other regularly scheduled final inning. It is called a "walk-off" home run because the teams walk off the field immediately afterward. Sportscasters also use the term "walk-off double" or other such terms if such a hit drives in the winning run to end the game. The terms walk-off hit by pitch, the bases loaded base on balls dubbed the "walk-off walk" or walk-off balk have been applied, and the latter has been dubbed a balk-off (these types of questionable walk-offs are seen by some fans as cheapening the concept). Although the concept is as old as baseball, the term itself has come into wide use only since the 1990s.