A double entry visa is a specific type of travel authorization that allows a foreign national to enter the issuing country twice within a designated period of validity. This is distinct from a "single entry" visa (which becomes void the moment you leave the country) and a "multiple entry" visa (which allows unlimited trips). A double entry visa is particularly useful for travelers whose itineraries involve a side trip to a neighboring nation; for example, if you are visiting Thailand, take a three-day trip to Cambodia, and then return to Thailand to catch your flight home, you would need a double entry visa to re-enter legally. In 2026, the application process for a double entry visa often requires you to provide a detailed itinerary or flight bookings that justify the need for two separate entries. While it is usually slightly more expensive than a single entry visa, it is much more convenient and cost-effective than applying for two separate visas. Once you have used both "entries," the visa is considered exhausted, regardless of how much time is left before the official expiration date.