Baseball is a bat-and-ball game played between two teams of 9 players on a large field with bases. The field is divided into the infield diamond and foul lines that extend from home plate into the outfield. Key parts of the field include the pitcher's mound, bases, and coaches' boxes. The basic rules are that batters are out after 3 strikes, if a fielder tags them with the ball before reaching base, or if a base runner is forced out or tagged while off a base. Fouls and strikes are also important gameplay elements.