Immigrant and nonimmigrant are the two types of visas. The granting or denying of visas helps achieve the goals of immigration laws. Nonimmigrant visas are granted to those who do not intend on staying permanently in the U.S., and usually are tourists and business visitors. There are eighteen types of nonimmigrant visas, and most of these are not limited in number. Those who hold immigrant visas are entitled to stay in the U.S. permanently and eventually apply for citizenship. Immigrant visa holders may work in the U.S. Congress establishes limits on the number immigrant visas available