What is the difference between an immigrant and non-immigrant visa?
A non-immigrant visa (B-1/B-2 visa is non-immigrant type of visa) signifies that you will be able to travel to the United States as a temporary visitor. You cannot stay in the United States permanently with a non-immigrant visa and in general you cannot work. With an immigrant visa, you will be able to live and work in the United States for as long as you wish to do so.