Citizen of a foreign country who wishes to enter the USA must first take a visa, either a non-immigrant visa for temporary stay, or an immigrant visa for permanent. Visitor Visa are of different types depending on the Requirement.
Business tour (B-1 Visa Category)
Pleasure Sight Seeing Tour (B-2)
And combination of both that is (B1/B2)
There are also interview taken by embassy to grant visa and more detail are required to get successful visa stamping.
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