What are the visa classifications in the United States?

American visas are divided into two categories: immigrant visas and non-immigrant visas. An immigrant visa is a visa that intends to immigrate to the United States for permanent residence. Generally, an application must be made to the US Immigration Service. After the examination and approval by the Immigration Bureau, an approval letter will be issued to foreign applicants. Then the applicant applies for an immigrant visa to the American consulate abroad with an immigration approval letter, and the immigrant applicant enters the United States with an immigrant visa and obtains a permanent residence card (green card). The categories of non-immigrant visas are mainly classified according to the main purpose of the applicant's visit to the United States. With few exceptions. People who visit the United States with non-immigrant visas can only engage in matters related to their visa types in the United States. Immigration visas are divided into relatives, marriage and occupation. Non-immigrant visas are classified into class A (diplomats), class B (short-term visitors), class C (transit personnel), class D (aircrew), class E (special investors), class F (study visas), class G (personnel of international organizations), class H (temporary employees, personnel with special skills), class I (journalists) and class J (journalists). N (representatives of NATO member countries), O (outstanding talents and assistants), P (international celebrities), Q (cultural exchange personnel), R (religious people), S (special information providers) and T (North American Resource Trade Act).