What is this called?

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Hey everyone, im new to these forums but i have been doing research on real estate investing for a while now.

I have a friend that what he does is he pretty much acts as a real estate investor but he does not have a license, he gets the house leased to him and options. So he can sell the house as his pretty much. He then makes profit from that. I know he made 18,000 off one house and he said it took about 3 weeks to do

What type of investing is this and how do you do it?