Preparing the B-2 Visitor Visa requires several items to be proven.
Generally, a citizen of a foreign country who wishes to enter the United States must first obtain a visa, either a nonimmigrant visa for a temporary stay, or an immigrant visa for permanent residence. Visitor visas are nonimmigrant visas for persons who want to enter the United States temporarily for business (visa category B-1), for tourism (visa category B-2), or for a combination of both purposes (B-1/B-2).
How to Prepare a B-2 Visitor Visa Packet – Avvo.com http://ping.fm/S8ewL