Basically, the DH is a player, used to bat instead of the pitcher. The rationale being that pitchers are usually weak hitters, so having another bat in the lineup would strengthen the offense. The DH offers American League managers 2 options in setting their teams' lineups: 1) they can either rotate the role among players (e.g., using a left-handed hitting DH against a right-handed pitcher and vice-versa) or 2) they can employ a full-time DH. During the World Series, the DH is employed when the team begins a plays in an American League park. This October, the DH will be employed during Games 3-5 in Texas. The pitchers will have to bat for themselves when playing in San Francisco, Games 1-2 and 6-7.