Polo is a sport that involves two teams of players riding on horseback and using mallets to hit a small ball into the opposing team's goal. It is believed to have originated in Persia over 2, 000 years ago and is now played in many countries around the world. The objective of the game is to score the most goals by hitting the ball between two goal posts. The game is usually played on a grass field, but can also be played on sand or ice.