Visa is important because its a certificate which provides someone permission to go into a specific nation and stay there for a locate period of time. showing that a
person is conditionally 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
(or passport-replacing document). 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. 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.
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. Some countries do not require a visa in some
situations, such as a result of reciprocal treaty arrangements. 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.
Some countries require that their citizens, as well as foreign
travelers, obtain an "exit visa" to be allowed to leave the country.

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