Passport ranking refers to the classification of passports based on the number of countries their holders can visit without a visa or with visa-on-arrival access. This ranking is often published annually by organizations like the Henley Passport Index, which evaluates the strength of passports from various countries around the world. A higher passport ranking indicates greater travel freedom, allowing citizens to explore more destinations with fewer restrictions. For example, a passport from Japan or Singapore typically ranks at the top, granting access to over 190 countries, while others may have limited access, reflecting the diplomatic relationships and agreements between nations.