Explaining Real Estate and It's Etymology

The terms real estate and real property are used primarily in common law, while civil law jurisdictions refer instead to immovable property.

Etymology:
In law, the word real means relating to a thing (res/rei, thing, from O.Fr. reel, from L.L. realis "actual," from Latin. res, "matter, thing"[2]), as distinguished from a person. Thus the law broadly distinguishes between "real" property (land and anything affixed to it) and "personal" property (everything else, e.g., clothing, furniture, money). The conceptual difference was between immovable property, which would transfer title along with the land, and movable property, which a person would retain title to. The oldest use of the term "Real Estate" that has been preserved in historical records was in 1666 .[2]
The use of "real" to refer to land also reflects the ancient preference for land, and the ownership thereof (and the owners thereof). This, in turn reflects the values of the medieval feudal system, which is the ultimate root of the common law.

It has been argued that the word Real is derived from "royal" (The word royal—and its Spanish cognate real—come from the related Latin word rex-regis, meaning king. For hundreds of years the Royal family / King owned the land, and the peasants paid rent or property taxes to be on the Royal's land. The word "Real" in Spanish is "Royal". Similar to El Camino Real, or Royal street. Today, just like hundreds of years in the past, we pay property taxes, or rent to be on the government's land or the Royal Estate). However, the "real" in "real property" is derived from the Latin for "thing"[3].