In baseball

Baseball

Baseball is a bat-and-ball sport played between two teams of nine players each. The aim is to score runs by hitting a thrown ball with a bat and touching a series of four bases arranged at the corners of a ninety-foot diamond...

, the designated hitter rule is the common name for Major League Baseball

Major League Baseball

Major League Baseball is the highest level of professional baseball in the United States and Canada, consisting of teams that play in the National League and the American League...

 Rule 6.10, an official position adopted by the American League

American League

The American League of Professional Baseball Clubs, or simply the American League , is one of two leagues that make up Major League Baseball in the United States and Canada. It developed from the Western League, a minor league based in the Great Lakes states, which eventually aspired to major...

 in 1973 that allows teams to designate a player, known as the designated hitter (abbreviated DH), to bat in place of the pitcher

Pitcher

In baseball, the pitcher is the player who throwsthe baseball from the pitcher's mound toward the catcher to begin each play, with the goal of retiring a batter, who attempts to either make contact with the pitched ball or draw a walk. In the numbering system used to record defensive plays, the...

 each time he would otherwise come to home plate, rather than replace him by pinch-hitting

Pinch hitter

In baseball, a pinch hitter is a substitute batter. Batters can be substituted at any time while the ball is dead ; the manager may use any player that has not yet entered the game as a substitute...

. Since then, most collegiate, amateur, and professional

Professional baseball

Baseball is a team sport which is played by several professional leagues throughout the world. In these leagues, and associated farm teams, players are selected for their talents and are paid to play for a specific team or club system....

 leagues have adopted the rule or some variant; MLB's National League

National League

The National League of Professional Baseball Clubs, known simply as the National League , is the older of two leagues constituting Major League Baseball, and the world's oldest extant professional team sports league. Founded on February 2, 1876, to replace the National Association of Professional...

 and Nippon Professional Baseball's Central League

Central League

The or is one the two professional baseball leagues that constitute Nippon Professional Baseball in Japan. The winner of the league championship plays against the winner of the Pacific League in the annual Japan Series. It currently consists of six teams from around the country,The Central League...

, are the most prominent professional leagues that do not use a designated hitter.
In Major League Baseball, the designated hitter is a hitter who does not play a position, but instead fills in the batting order for the pitcher.