Rugby sevens is a special type of rugby game where there are only 7 players (rather than the usual 15) on each team playing on a smaller field. The aim of the game is to carry a special ball over the opponent's goal line, while the other team tries to stop you by tackling you to the ground.
Each half of a game is only 7 minutes long, so it's a fast and exciting game!
The players have to follow certain rules, like passing the ball backwards (not forwards) and only tackling a player who has the ball. They also have to wear special clothing and protective gear, like helmets and pads, so they don't get hurt.
There are tournaments all over the world where different teams from different countries compete against each other in rugby sevens. People love watching and cheering for their favorite team, and it can get pretty loud and crazy!