A visa is a conditional authorization granted by a polity to a foreigner that allows them to enter, remain within, or leave its territory. Visas typically include limits on the duration of the foreigner's stay, areas within the country they may enter, the dates they may enter, the number of permitted visits, or if the individual can work in the country in question. Visas are associated with the request for permission to enter a territory and thus are, in most countries, distinct from actual formal permission for an alien to enter and remain in the country. In each instance, a visa is subject to entry permission by an immigration official at the time of actual entry and can be revoked at any time. Visa evidence most commonly takes the form of a sticker endorsed in the applicant's passport or other travel document but may also exist electronically. Some countries no longer issue physical visa evidence, instead recording details only in immigration databases.
A certificate of identity, sometimes called an alien's passport, is a travel document issued by a country to non-citizens residing within their borders who are stateless persons or otherwise unable to obtain a passport from their state of nationality. Some states also issue certificates of identity to their own citizens as a form of emergency passport or otherwise in lieu of a passport. The visa requirements of certificates of identity may be different from those of regular passports.
The Hong Kong Certificate of Identity (CI) was a formal travel document and passport, issued by the Hong Kong Government's Immigration Department until 30 June 1997. It is no longer possible to possess a valid CI as a travel document, as all CIs have expired by 30 June 2007, though most CI holders should be eligible to hold the HKSAR Passport.
The National Registration Identity Card (NRIC), colloquially known as "IC", is a compulsory identity document issued to citizens and permanent residents of Singapore. People must register for an NRIC within one year of attaining the age of 15, or upon becoming a citizen or permanent resident. Re-registrations are required for persons attaining the ages of 30 and 55, unless the person has been issued with an NRIC within ten years prior to the re-registration ages.
Visitors to the United States must obtain a visa from one of the U.S. diplomatic missions unless they are citizens of one of the visa-exempt or Visa Waiver Program countries.
A travel document is an identity document issued by a government or international entity pursuant to international agreements to enable individuals to clear border control measures. Travel documents usually assure other governments that the bearer may return to the issuing country, and are often issued in booklet form to allow other governments to place visas as well as entry and exit stamps into them.
A refugee travel document is a travel document issued to a refugee by the state which they normally reside in, allowing them to travel outside that state and to return there. Refugees are unlikely to be able to obtain passports from their state of nationality and therefore need travel documents so that they might engage in international travel.
The Singapore passport is a passport issued to citizens of the Republic of Singapore. It enables the bearer to exit and re-enter Singapore freely; travel to and from other countries in accordance with visa requirements; facilitates the process of securing assistance from Singapore consular officials abroad, if necessary; and requests protection for the bearer while abroad.
The Macao Special Administrative Region Travel Permit is a biometric international travel document issued to non-permanent residents of Macao SAR holding Chinese nationality, who also possess a Macao SAR Non-Permanent Resident Identity Card, and are not eligible for any other type of travel document. Permanent residents of Macao of non-Chinese nationality are also eligible.
The Canadian Certificate of Identity is an international travel document issued by Immigration, Refugees and Citizenship Canada to a permanent resident of Canada who is not yet a Canadian citizen, is stateless, or is otherwise unable to obtain a national passport or travel document. It is a biometric document with a grey cover and is bilingual in both English and French. The validity period of the travel document is determined by the issuing office.
The Bruneian International Certificate of Identity (ICI) is an international travel document issued by the Immigration and National Registration Department to Bruneian permanent residents who are stateless. It is valid for five years.
The visa policy of Malaysia consists of the requirements for foreign nationals to travel to, enter, and remain in Malaysia. Most visitors to Malaysia are granted visa-free entry for a period of 90, 30, or 14 days respectively. However, nationals from some countries must first obtain a visa from one of the Malaysian diplomatic missions around the world before being allowed into the country.
Visitors to Thailand must obtain a visa from one of the Thai diplomatic missions unless they are citizens of one of the visa-exempt countries, or citizens who may obtain a visa on arrival, or citizens eligible for an e-Visa.
The visa policy of Singapore deals with the requirements a traveller must meet to enter Singapore. A foreign national, depending on their country of origin, must meet certain requirements to obtain a visa, which is a permit to travel, to enter and remain in the country. A visa may also entitle the visa holder to other privileges, such as a right to work, study, etc. and may be subject to conditions.
The Japan Re-entry Permit is a travel document similar to a certificate of identity, issued by Japan's Ministry of Justice. It is a passport-like booklet with a light brown cover with the words "再入国許可書 RE-ENTRY PERMIT TO JAPAN" on the front.
Visitors to Azerbaijan must obtain a visa from one of the Azerbaijani diplomatic missions unless they are citizens of one of the visa-exempt countries, or citizens eligible for an electronic visa on arrival, or citizens eligible for an electronic visa.
The Australian Certificate of Identity (COI) is a biometric travel document issued by the Department of Foreign Affairs and Trade to individuals who are not Australian citizens and are about to leave Australia or one of its territories.
The visa policy of Lebanon deals with the requirements which a foreign national wishing to enter the Republic of Lebanon must meet to be permitted to travel to, enter and remain in the country.
The Re-entry Permit is a travel document similar to a certificate of identity, issued by the United States Citizenship and Immigration Services to U.S. lawful permanent residents to allow them to travel abroad and return to the United States. It is a green passport-like booklet with the words Travel Document, a symbol, and other official wording in blue-gray. Individuals whose application for permanent residency has not yet been approved can apply instead for advance parole.
Automated border control systems (ABC) or eGates are automated self-service barriers which use data stored in a chip in biometric passports along with a photo or fingerprint taken at the time of entering the eGates to verify the passport holder's identity. Travellers undergo biometric verification using facial or iris recognition, fingerprints, or a combination of modalities. After the identification process is complete and the passport holder's identity is verified, a physical barrier such as a gate or turnstile opens to permit passage. If the passport holder's identification is not verified or if the system malfunctions, then the gate or turnstile does not open and an immigration officer will meet the person. E-gates came about in the early 2000s as an automated method of reading the then-newly ICAO mandated e-passports.
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