There are two types of volleyball, the normal kind played indoors and the more glamorous beach volleyball played outside.
Because of the (small) outfits the players wear they often attract headlines for how they look rather than how they play.
That's a shame, because beach volleyball can be a thrilling sport to watch as it is very fast moving.
When played indoors, each team has six players with another six on the sidelines.
The idea is to get the ball from your side of the court, over a high net, without it touching the ground.
It is allowed to be touched three times by a team, but must be hit over the net before a fourth touch or it hits the ground.
In beach volleyball, whichever team forces the ball to hit the ground on the other side of the net wins the point.
Now that this rule has been adopted indoors too, although in the past only the serving team was able to score points.