4avisa provides general information on study, travel, work visa and business visa (Visa Application Form) requirements and the addresses of embassies worldwide. 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, Visa Application Form, and relates to the purpose of your travel. Having a U.S. visa allows you to travel to a port-of-entry. Anyone who is not eligible to enter the United States visa-free under the Visa Waiver Program, or is not exempt from the visa requirement, needs a visa (Visa Application Form)