USA Visitor Visa

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).

Here are some examples of activities permitted on B1 Visitor Visa and B2 Visitor Visa

B1 Visitor Visa

Consult with business associates
Attend a scientific, educational, professional, or business convention or conference
Settle an estate
Negotiate a contract

B2 Visitor Visa

Tourism
Vacation (holiday)
Visit with friends or relatives
Medical treatment
Participation in social events hosted by fraternal, social, or service organizations
Participation by amateurs in musical, sports, or similar events or contests, if not being paid for participating
Enrollment in a short recreational course of study, not for credit toward a degree (for example, a two-day cooking class while on vacation)