Real estate is a legal term (in some jurisdictions, such as the USA, United Kingdom, Canada, Australia and The Bahamas) that encompasses land along with anything permanently affixed to the land, such as buildings, specifically property that is fixed in location.
Real estate law is the body of regulations and legal codes which pertain to such matters under a particular jurisdiction and include things such as commercial and residential real property transactions. Real estate is often considered synonymous with real property (sometimes called realty), in contrast with personal property (sometimes called chattel or personalty under chattel law or personal property law).