Immigrating to the United States is an important and complex decision. In this section, you will learn about who may immigrate to the United States, the different types of immigrant visas, the required forms, and the steps in the immigrant visa process. Because most immigrants receive visas in the family or employment based visa categories, they are a key focus of this section. To be eligible to apply for an immigrant visa, a foreign citizen must be sponsored by a U.S. citizen relative, U.S. lawful permanent resident, or a prospective employer, with a few exceptions, explained below. The sponsor begins the immigration process by filing a petition on the foreign citizen’s behalf with U.S. Citizenship and Immigration Services (USCIS).