In Mexico, a maquiladora (Spanish pronunciation: [makilaˈðoɾa]) or maquila (IPA: [maˈkila]) is a manufacturing operation, where factories import certain material and equipment on a duty-free and tariff-free basis for assembly, processing, or manufacturing and then export the assembled, processed and/or manufactured products, sometimes back to the raw materials' country of origin. They are an example of special economic zones as seen in many countries.