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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A tree on its side, with the trunk on the left and an increasing number of branches to the right.A tree on its side, with the trunk on the left and an increasing number of branches to the right.A tree on its side, with the trunk on the left and an increasing number of branches to the right.A tree on its side, with the trunk on the left and an increasing number of branches to the right.
i looks circular like
probability
I hate math
looks like yo mamas butt