F1 Visa: This visa is designated for unmarried sons and daughters of U.S. citizens and their minor children, if any.
F2A Visa: This category allows spouses and minor children (under 21 years old) of lawful permanent residents to apply for residency.
F2B Visa: This visa is for unmarried sons and daughters over the age of 21 of lawful permanent residents.
F3 Visa: This visa category is for married sons and daughters of U.S. citizens, along with their spouses and minor children.
F4 Visa: Reserved for siblings of U.S. citizens and their spouses and minor children, as long as the U.S. citizen sponsor is over 21 years old.