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Content View Hits : 232611How to use a visa?
Answer
A single-entry visa allows travel to the U.S. only once within the period of the visa’s validity. That is, once you travel to the U.S. and then leave the country, you may not reenter again on that same visa. A multiple-entry visa allows travel to the U.S. several times within the period of the visa’s validity. At the point of entry to the U.S., an immigration officer will indicate how long the visa holder is permitted to stay in the country.
Visitors to the United States must have a visa and a passport, which is valid for at least 6 months beyond the intended date of departure from the U.S.
NOTE: If the international passport has expired/will expire in less than 6months and it has a valid visa in it, the visa holder may travel to the U.S. with this passport along with a newly issued passport. The traveler's nationality indicated in the new passport must be the same as in the visa bearing passport. The difference in the name transliteration in two passports will not affect the visa validity.
About letter of invitation
A "Letter of invitation" is supplementary information that explains a visa applicant's intended purpose of travel and often useful. A letter of invitation explaining the nature of applicant's business in the U.S. and the nature of the relationship between the inviting party and the applicant is helpful. By writing a letter of invitation, you are not legally responsible for the visitor once they get to USA, but you should provide the letter in good faith. You must give truthful information and intend to keep the promises you made in the letter.