Visa is permission that a person can visit a foreign country. It is issued by the consulate or embassy and is stamped on the passport though there are certain cases in which the visa is issued on a separate paper.
Every country has certain requirements without which it will not grant a visa. There are various kinds of visas including visit, employment and study. The two main categories though are immigrant and non-immigrant visa.
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A permit is the permission to enter the country. It carries on it the details of your status though it may not be understandable to people who are not related to the immigration and law enforcement departments.
The permission to enter a country on non-immigration visa is generally for a specified amount of time. In some countries, the term permit is used for a visa with which you can work in that country on temporary or permanent basis.
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