Travel Authorization is a formal approval required for travelers to enter certain countries. It ensures that individuals meet specific entry requirements, such as having a valid passport and no criminal history. This process is often completed online, allowing travelers to receive their authorization quickly. Many countries, including those in the European Union and United States, use travel authorization systems to enhance security and streamline border control. For example, the Electronic System for Travel Authorization (ESTA) is required for citizens of Visa Waiver Program countries traveling to the U.S. without a visa.