Many people incorrectly believe that "apartment" is any kind of housing that is located in apartments. Both are a tiny self-contained apartment that has its own kitchen, bathroom, living room and bathroom. In certain parts of the US, the term apartment is also a reference to a prefabricated structure within a building, whereas the term"prefabricated unit" refers to a prefabricated structure, generally a single-family dwelling that is built in an older style of building. It's easy to mix the two terms because they share the same functions.