Baseball is a sport played between two teams usually of nine players each. It is a
   bat-and-ball game in which a pitcher throws (pitches) a hard, fist-sized, leather-covered ball
   toward a batter on the opposing team. The batter attempts to hit the baseball with a tapered
   cylindrical bat, made of wood (as required in professional baseball) or a variety of other
   materials (as allowed in many nonprofessional games). A team scores runs only when batting, by
   advancing its players—primarily via hits—counterclockwise past a series of four markers called
   bases arranged at the corners of a ninety-foot square, or "diamond." The game, played without
   time restriction, is structured around nine segments called innings. In each inning, both
   teams are given the opportunity to bat and score runs; a team's half-inning ends when three
   outs are recorded against that team.

   There are four basic tools of baseball: the bat, the ball, the mitt, and the field.

     o The bat is an offensive tool, either made of wood or aluminum depending on the game being
       played. It is a long, hard stick, about 2 inches (5 centimeters) in diameter, except at
       the handle, which is about 1-inch (2.5 centimeters) diameter.
     o The ball is white for baseball (though other colors can be used) with red lacing about the
       size of a fist. Softball uses a white or yellow ball (usually) with white lacing about the
       size of two fists.
     o The glove or mitt is a defensive tool, made of leather, worn on the players hand to aide
       in catching the ball. It takes various shapes to meet the unique needs of the defensive
       position of the player.
     o The game is played on a field, whose dimensions vary depending on the age of the players.
       However, every field has a diamond, with bases at its corners, that the offensive players
       circumnavigate, as mentioned above. That part of the field close to the bases is called
       the infield, and that part distant from the bases is called the outfield.

   Diagram of a baseball diamond