A visa-on-arrival is a type of travel authorization that allows visitors to obtain their visa at the airport or border upon entering a country. This process simplifies travel for tourists, as they do not need to apply for a visa in advance. Instead, they can complete the necessary paperwork and pay any required fees upon arrival. Countries that offer visa-on-arrival typically have specific eligibility criteria, such as nationality or purpose of visit. Travelers should check the regulations for their destination to ensure they meet the requirements and have the necessary documents ready for a smooth entry process.