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As the title says:

Where does the random in Random Forests come from?

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    $\begingroup$ Already explained in the Wikipedia article on random forests: en.wikipedia.org/wiki/Random_forest#Tree_bagging, en.wikipedia.org/wiki/…. I suggest you read standard references before asking -- it'll help you to ask a better question, or let you answer your own question. There's little point in us duplicating material already available on standard resources (like Wikipedia). $\endgroup$ – D.W. Jul 9 '16 at 2:01
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For each tree you randomly select from the variables that you can use to split tree nodes. Generally you randomly select 1/3 of the variables per tree.

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