Visa and security

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. Many countries do not require a visa in some situations; this may be the result of treaties specifying reciprocal 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.

- Wikipedia

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