An entrepôt or transshipment port is a port, city, or trading post where merchandise may be imported, stored, or traded, usually to be exported again. Such cities often sprang up and such ports and trading posts often developed into commercial cities due to the growth and expansion of long-distance trade. These places played a critical role in trade during the days of wind-powered shipping. In modern times customs areas have largely made entrepôts obsolete, but the term is still used to refer to duty-free ports with a high volume of re-export trade. Entrepôt also means 'warehouse' in modern French, and is derived from the Latin roots inter 'between' + positum 'position', literally 'that which is placed between'.