One of the fastest moving of the Olympic sports, and dominated by players from Asia.
The sport's rules have been changed a bit recently to try and make it a bit easier to watch for spectators.
It's played as both doubles and singles and is a fascinating sight when players are driven further and further from the table, but still manage to keep the ball in play.
The first player to win three sets wins a match, and they need 11 points to win a set.
If scores are tied at 10 each then they keep going until one player has a two-point lead.
In doubles the players must hit the ball in turn.
For example, the server serves to the receiver who returns the ball. The server's team-mate must hit it next, followed by the receiver's team-mate.
If either team breaks the order they lose the point.
There is a strange rule called the "expedite" system that is supposed to speed up the game.
If a set has not finished after 10 minutes the umpire stops the game.
From then on, if a returner hits the ball back 13 times they win a point, if they don't the server wins the point.