- A passport is a citizenship document. Possession of a passport from a particular country defines the traveler as a citizen of that country.
- National governments are the issuing authority for passports. In most cases, any citizen of a particular nation may possess a passport, but some countries grant passports to only a select few.
- A visa is an ink stamp, usually stamped directly in the passport, authorizing a person from another country to visit the country issuing the visa. Visas can be valid from days to years.
- Visas are issued by the consular staff of the destination country. It can take anywhere from hours to months for the consulate to issue the visa.
- In some cases, visas are not required because of an agreement between two governments. For example, an American citizen flying into Hong Kong is not required to apply for a visa in advance. A temporary visitor's visa will be automatically issued to American travelers who arrive without a different type of visa.
- In some cases, if you are flying through a country and wish to stay for a few days, a transit visa can be issued. These visas are usually valid for a few days.













