A baseball diamond is the layout of a baseball field, shaped like a square or a diamond. It consists of four bases: home plate, first base, second base, and third base. Players run around these bases to score runs, and the distance between each base is typically 90 feet in professional baseball. The diamond is surrounded by an outfield, which is the grassy area beyond the bases. The infield, where the bases are located, is usually made of dirt. The pitcher's mound, where the pitcher stands to throw the ball, is located in the center of the infield.