A visa is a primary requirement of a foreign national who is not a citizen of one of the twenty-seven coutries included in the Visa Waiver Program, not a citizen of Bermuda or Canada or anyone who has past criminal record, and wants to enter the United States.
There are mainly two types of visas namely: nonimmigrant and immigrant visa. A nonimmigrant visa is for temporary visits like business trips, work, tourism or studying while an immigrant visa is designed for people who want to obtain permanent residency in the United States without any time limitation.
Other Types of Visas
K Visas for Immediate Relatives
These are for people who have the intent to immigrate in the United States whereby the U.S. citizen will apply for a K temporary visa for the spouse or fiancee and unmarried children of spouse or fiancee. It should also be noted that same sex partners of U.S. citizens are not recognized by the U.S. Citizenship and Immigration Services (USCIS).
B-1/B-2
This is the most common visa type. It is a temporary visa given to people who travel for business (B-1) and for pleasure (B-2).
L-1 Intracompany Transferee
This visa is granted for individuals who have worked for related companies abroad for at least a year in the past three years that will transfer to the United States to acquire a higher position, usually managerial or executive or for a specialized skill.
H-1B
This is the type whereby employers petition employees who obtained the minimum requirement of holding a bachelors degree in a specific field. The employer needs to file a Labor Condition Application (LCA) with the Department of Labor before an H-1B petition can be made.
V Visas and Life Act
This type is for the final step of the Legal Permanent Resident process which is called adjustment of status. Form I-485 should be filed by the foreign national in question.
TN Visa for Canadians and Mexicans
The TN status facilitates the entry of Canadian and Mexican nationals who would like to travel or work in the United States. This classification was created by NAFTA and must require services from a NAFTA professional.