Generally, a citizen of a foreign country who wishes to enter the desired country must first obtain a visa, either a nonimmigrant visa for a temporary stay, or an immigrant visa for permanent residence. Visitor visas are nonimmigrant visas for persons who want to enter as a temporarily, for tourism purpose or to meet any friend/family Member.
With this visa you can:
-Visit family and/or friends
-Be here as a tourist, for a cruise or for any purpose except business or medical treatment
You can study or train for up to 3 months on this visa. But if your main reason for travelling to abroad is study, a student visa might be more appropriate. You can't work.