A duty-free store is a retail outlet that sells goods exempt from the payment of certain local or national taxes and duties. These stores are typically located at international airports, seaports, and border crossings, allowing travelers to purchase items without the added costs of taxes. Common products found in duty-free stores include alcohol, tobacco, perfumes, cosmetics, and luxury goods. To shop at a duty-free store, customers usually need to show a valid passport and proof of international travel. The items purchased are meant for personal use and are subject to specific limits on quantity and value when brought into a different country.