VISA
A visa is a document, normally affixed within the passport, allowing the bearer or alien to apply for entry into the country in question. It simply allows the alien to travel to present himself or herself to an immigration officer at a designated port-of-entry. It does not guarantee entry into that country; the officer on the spot may still reject you. However, for many places not having a visa guarantees rejection at the border if you make it that far and is quite likely to prevent boarding an aircraft or ship to get there.
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