How many bases are there on a baseball field?

A baseball field consists of four bases: first base, second base, third base, and home plate. These bases form a diamond shape and are essential for the gameplay, as players must touch each base in sequence to score runs.

While there are various elements on a baseball field, such as the outfield and the pitcher's mound, the fundamental base system used for running and scoring in baseball is strictly comprised of these four bases. This structure is critical for understanding how the game is played, including the rules around base running and scoring. Other choices may refer to elements of the game, but the standard configuration of the baseball field is defined by these four bases, making the answer clear and accurate.