There are many different types of tournaments. Tournaments can be involved with sports. Tournaments can also be involved with games, such as chess or cards. Tournaments can also be academic.

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Robotics tournaments are like tournaments for humans, except robots are the ones competing.

There is the Pokemon card tournaments and video game tournaments.

Usually, Halo tournaments are held within your community, but if you check Bungie.net, they do occasionally advertise tournaments.