What is the American immigrant visa package?

Visa package generally refers to immigrant visa, right? Non-immigrant visa has no bag. I'll give you your passport back.

There are two kinds of visas for F 1, one is a student visa and the other is a citizen's unmarried adult child visa. The former does not have a visa package, while the latter does. The so-called visa package only contains some forms, notaries, medical reports and other supporting materials submitted during the immigration visa process, and must be handed over to the immigration officials of the customs when entering the country.