To understand the meaning of apartments, we must first understand another concept in the real estate industry, called Multifamily Housing.
The meaning of this concept is to have more than one residential unit (Unit), or a building with multiple residential units. Multi-family buildings can be divided into two categories. The first category is buildings with two to four residential units. This is what we often call two to four families.
The second family is called Duplexes in English, the third family is called Triplexes, and the fourth family is called Quadruplexes. The second category is a building with five or more residential units. This is what we usually call an apartment (Apartment Building).