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.
http://en.wikipedia.org/wiki/Visa_%28document%29
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