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.
The visa policy of the Schengen Area is a component within the wider area of freedom, security and justice policy of the European Union. It applies to the Schengen Area and to other EU member states except Ireland. The visa policy allows nationals of certain countries to enter the Schengen Area via air, land or sea without a visa for up to 90 days within any 180-day period. Nationals of certain other countries are required to have a visa to enter and, in some cases, transit through the Schengen area.
Visitors to the mainland of the People's Republic of China must obtain a visa from one of the Chinese diplomatic missions unless they are citizens of one of the visa-exempt countries. The residents of Hong Kong, Macao, and Taiwan with Chinese nationality may stay in Mainland indefinitely as long as their travel documents are valid.
Visitors to Kyrgyzstan must obtain an e-Visa unless they are citizens of one of the visa-exempt countries or citizens who may obtain a visa on arrival.
A Mexican visa is a document issued by the National Institute of Migration, dependent on the Secretariat of the Interior, with the stated goal of regulating and facilitating migratory flows into the country.
Visitors to Tonga must obtain a visa unless they come from one of the visa exempt countries or countries eligible for a Visa Waiver on Arrival. Visa applications must be sent to the Principal Immigration Officer in Nuku'alofa. All visitors must hold a passport valid for 6 months.
The visa policy of Albania allows citizens of certain countries to enter Albania without a visa. Citizens of certain other countries must obtain a visa from one of the Albanian diplomatic missions. Alternatively, they may obtain an electronic visa.
The visa policy of Turkey deals with the requirements that a foreign national wishing to enter Turkey must meet to be permitted to travel to, enter and remain in the country.
The visa policy of the United Kingdom is the policy by which His Majesty's Government determines visa requirements for visitors to the United Kingdom, and the Crown dependencies of Guernsey, Jersey, and the Isle of Man and those seeking to work, study or reside there.
Visitors to Colombia must obtain a visa from one of the Colombian diplomatic missions unless they come from one of the visa-exempt countries.
Maldives grants a free visa on arrival for 30 days to all citizens unless they are citizens of one of the visa-exempt countries.
Visitors to Pakistan typically must obtain a visa from one of the Pakistani diplomatic missions. Pakistani missions abroad offer various categories of visas, with some travelers eligible for visa on arrival if traveling as part of a group tour, or for business.
Pakistan also offers electronic visa application and electronic travel authorization for issuance of visa on arrival.
All visitors to Palau may generally obtain a visa on arrival, unless they are a citizen of one of the visa-exempt countries or a citizen of a country whose nationals must obtain a visa in advance.
Visitors to Qatar must obtain a visa, unless if they are citizens of one of the GCC countries or if they are citizens of one of the countries eligible for a visa waiver on arrival.
Visitors to Jamaica must obtain a visa from one of the Jamaican diplomatic missions, or in certain cases from one of the United Kingdom diplomatic missions, unless they come from one of the countries designated as visa-exempt countries or countries whose citizens may obtain a visa on arrival.
Most Commonwealth Citizens can visit Jamaica for up to 180 days visa-free.
All foreign nationals visiting Seychelles are granted visa free access. However, they are required to obtain a Visitor's Permit on arrival unless exempt.
Visitors to Cuba must obtain a visa before travel or a tourist card from one of the Cuban diplomatic missions, travel agencies or authorized airlines unless they come from one of the visa exempt countries.
Visitors to El Salvador must obtain a visa from one of the Salvadoran diplomatic missions, unless they come from one of the visa exempt countries. All visitors must hold a passport valid for 6 months.
Visitors to Egypt must obtain a visa from one of the Egyptian diplomatic missions unless they come from one of the visa exempt countries or countries that are eligible for visa on arrival.
The British Overseas Territories maintain their own entry requirements different from the visa policy of the United Kingdom. As a general rule, British citizens do not have automatic right of abode in these territories.
Omanportal 
