# Size of terminal node in decision tree?

I am having issues trying to understand what the size of a terminal node in a decision tree means? Could anyone give me an easy explanation?

I know a terminal node is a leaf node, one that has a label/class, however I can't get around my head why it has a size.

• @user777 in your answer above, you mean decision trees are built out[...], not Random Forests... – Antoine Sep 20 '15 at 19:14