A modular home is one that is built indoors in a factory setting. The finished products are covered and transported to their new locations, where the final assembly is by a Contractor. A modular home is not a mobile home; it is simply a home that is built off-site, as opposed to on-site. These homes are often called factory-built, system-built or prefab (short for prefabricated) homes.
Modular and manufactured homes are not the same. Manufactured homes are not placed on permanent foundations. Manufactured homes, sometimes referred to as (but are not always) mobile homes, can be moved from one location to another. There are specific laws and regulations regarding these relocations.