Real estates are physical properties consisting of lands and buildings, along with air rights and underground rights.
Real estate is categorized into 4 types: residential, commercial, industrial, and land.
There are 2 ways to invest in real estate: direct purchase of properties or buying shares in a REIT (Real Estate Investment Trust) or MBS (Mortgage-Backed Securities).
Both REITs and MBS are tradable the same way as stocks.