Dubai is known worldwide for being a huge duty free shopping area. In fact, property and goods entering in Dubai by sea, air or road, are not subject to customs duties (except for some specific product categories). In addition, there is no VAT system in Dubai as there may be in other countries. Products sold in Dubai are therefore deemed to be cheaper than in other countries. That's why tourism and shopping are always related in Dubai.
There are several Duty Free in Dubai and they are situated in different terminals of the international airport. However, Duty Free prices are generally aligned with those in the city. So the only advantage is mainly for a last minute shopping or for those who do not want to hassle a shopping in town but prefer to enjoy the city or doing activities.
Official website: www.dubaidutyfree.com