Real estate business means buying, selling, and renting of houses and buildings. People in real estate buy buildings and then look for people who want to rent or buy the building. For example, let's say your family wants to move to a new house. They could find a real estate business to help them look for a house to rent or buy. Once they find the perfect house, the real estate business will help them take care of the paperwork and help them move into the new house.