Key aspects of travel documents include:

Passport: The most common type of travel document is a passport, which is issued by a government to its citizens for the purpose of international travel. A passport typically contains biographical information about the holder, such as their name, date of birth, and nationality, as well as a photograph and signature. It serves as a primary form of identification and allows the holder to enter and exit foreign countries.
Visa: In addition to a passport, individuals may require a visa to enter certain countries. A visa is an endorsement or stamp placed in the passport by the immigration authorities of a foreign country, granting permission for the holder to enter and stay in that country for a specified period and for specific purposes, such as tourism, business, or study. Visas may be obtained in advance from a consulate or embassy of the destination country or issued upon arrival at the port of entry.
Refugee travel document: Individuals granted refugee status or asylum in a foreign country may be issued a refugee travel document, also known as a Refugee Passport or a Convention Travel Document. This document allows refugees and asylees to travel internationally and re-enter the country that has granted them protection without requiring a passport from their country of origin.
Re-entry permit: Some countries require their citizens who are permanent residents or long-term visa holders to obtain a re-entry permit before leaving the country for an extended period. A re-entry permit allows the holder to re-enter the country without jeopardizing their immigration status or residency rights.
Other travel documents: In addition to passports, visas, and refugee travel documents, there are other types of travel documents issued for specific purposes or under special circumstances, such as seafarer’s identity documents, crew member certificates, and stateless person’s travel documents.