1.US B-1 Business visitor visa and B-2 Visitor for Pleasure Visa
CaUS B-1 Business visitor visa and B-2 Visitor for Pleasure Visa: Business travelers may enter the United States using a B-1 'Visitor for Business' Visa. Typically these visas are issued as joint B-1 business visit visa and B-2 'Visitor for Pleasure' (i.e. Tourist) visa. This practice means that, if a candidate has an old tourist visa, it may be valid for a planned business trip.
2.US B-1 and B-2 Visitor Visa Waiver Pilot Program
US B-1 and B-2 Visitor Visa Waiver Pilot Program: The B-1/B-2 Visa Waiver Pilot Program allows citizens of certain countries to visit the US for up to 90 days without a Visitor Visa.