A visa is a document showing that a person is authorized to enter or leave the territory for which it was issued, subject to permission of an immigration official at the time of actual entry. The authorization may be a document, but more commonly it is a stamp endorsed in the applicant’s passport. Some countries do not require a visa in some situations, such as a result of reciprocal treaty arrangements. The country issuing the visa typically attaches various conditions of stay, such as the territory covered by the visa, dates of validity, period of stay, whether the visa is valid for more than one visit etc.
A visa generally gives non-citizens clearance to enter a country and to remain there within specified constraints, such as a time frame for entry, a limit on the time spent in the country, and a prohibition against employment. The possession of a visa is not in itself a guarantee of entry into the country that issued it, and a visa can be revoked at any time. A visa application in advance of arrival gives the country a chance to consider the applicant’s circumstance, such as financial security, reason for applying, and details of previous visits to the country. A visitor may also be required to undergo and pass security and/or health checks upon arrival at the border.
Visas are associated with the request for permission to enter or exit a country and are thus, for some countries, distinct from actual formal permission for an alien to enter and remain in the country.
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