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In the area known as graph theory, a tree has nodes and edges joining the nodes.

A tree is a type of graph which is connected (you can get from each node to every other node by following the edges), but has no cycles (you can't follow edges around in a circle).

There is more, including a picture, here:

http://en.wikipedia.org/wiki/Tree_(graph_theory)

Trees have uses in computer science.

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