Duty-free shops are retail outlets that sell goods exempt from the usual taxes and duties imposed by the government. These shops are typically found in international airports, seaports, and border crossings, allowing travelers to purchase items without paying local taxes. This can make products like alcohol, tobacco, perfumes, and luxury goods more affordable. To shop at a duty-free store, customers must show a valid passport and often need to be traveling internationally. There are limits on the quantity of goods that can be purchased and brought into a country, so travelers should be aware of these regulations to avoid extra charges.