A citizen of a foreign country, wishing to enter the U.S., generally must first obtain a visa, either a nonimmigrant visa for temporary stay, or an immigrant visa for permanent residence. The type of visa you must have is defined by immigration law, and relates to the purpose of your travel. Visas are issued by American embassies and consulates.
Temporary Visitor Visas
Other Temporary Visas
Office of Biometric Identity Management
The Office of Biometric Identity Management's (OBIM), formerly US-VISIT, use of biometrics is helping to make travel simple, easy and convenient for legitimate visitors, but virtually impossible for those who wish to do harm or violate U.S. laws.