Real estate or immovable property is a legal term (in some jurisdictions) that encompasses land along with anything permanently affixed to the land, such as buildings. Real estate (immovable property) is often considered synonymous with real property (also sometimes called realty), in contrast with personal property (also sometimes called chattel or personalty). However, for technical purposes, some people prefer to distinguish real estate, referring to the land and fixtures themselves, from real property, referring to ownership rights over real estate.

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

In law, the word “real” means relating to a thing (from Latin res/rei, thing), 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 word is not derived from the notion of land having historically been “royal” property. The word royal — and its Castilian cognate “real” — come from the related Latin word rex-regis, meaning king.)

With the development of private property ownership, real estate has become a major area of business. Purchasing real estate requires a significant investment, and each parcel of land has unique characteristics, so the real estate industry has evolved into several distinct fields. Specialists are often called on to valuate real estate and facilitate transactions. Some kinds of real estate businesses include:

* Appraisal – Professional valuation services
* Brokerages – Assisting buyers and sellers in transactions
* Development – Improving land for use by adding or replacing buildings
* Property management – Managing a property for its owner(s)
* Real Estate Marketing – Managing the sales side of the property business
* Relocation services – Relocating people or business to a different country

Within each field, a business may specialize in a particular type of real estate, such as residential, commercial, or industrial property. In addition, almost all construction business effectively has a connection to real estate.