The defense in baseball refers to the team which is defending during the game. The defense team are the ones located on the infield and outfield and are composed of the pitcher, first baseman, second baseman, third baseman, shortstop, catcher and the outfielders. At any one time during a game of baseball, only nine defenders are allowed on the field.

The defense’s job is to prevent the offense (which is the team who are batting) from scoring hits and runs. They can do so by striking batters out, tagging them out or by putting them out.

You can read more about the positions in baseball and their roles here.