Real estate generally refers to real or physical property. It includes buildings, lands, air rights (above the land), and underground rights (below the land). But in terms of business, real estate also refers to buying, producing, and selling properties.
Real estate is real property that consists of land and improvements, which include buildings, fixtures, roads, structures, and utility systems. Title of ownership is given to the land, improvements, and natural resources such as minerals, plants, animals, water, etc which is called property rights.