The Henley Passport Index is a global ranking of countries based on the travel freedom their citizens enjoy. It measures how many destinations passport holders can access without a prior visa, providing a clear picture of the strength of different passports. The index is updated quarterly and is widely referenced by governments, businesses, and travelers. The index is compiled by Henley & Partners, a global citizenship and residence advisory firm. It uses data from the International Air Transport Association (IATA) and other sources to assess the visa-free access of each country's passport. This information helps individuals understand their travel options and the relative power of their nationality.