"Duty-free" refers to goods that can be purchased without the added taxes or duties typically imposed by a government. These items are usually sold at airports, seaports, and border crossings, allowing travelers to buy products like alcohol, tobacco, and perfumes at lower prices. However, there are limits on the quantity of duty-free items one can bring into a country. To qualify for duty-free shopping, customers must show proof of international travel, such as a passport and a boarding pass. Each country has its own regulations regarding what can be purchased duty-free and the maximum value allowed, so it's important for travelers to be aware of these rules before making a purchase.