B-1 and B-2 visas are both temporary US visit visas. Both visa types are non-immigrant visas issued to enter the US temporarily. The B-1 visa is granted to individuals to enter the USA for business-related reasons, such as attending conferences, business meetings, contracts, etc., while the B-2 visa is for individuals who are visiting the US for a vacation, to visit family or friends, to undergo medical treatment, or to attend social events.