The B-1 and B-2 visas are non-immigrant visitor visas that allow foreign nationals to enter the US temporarily. A B-1 visa is a business visa that allows foreign nationals to enter the US for reasons including attending business meetings, conferences, contracts, etc. A B-2 visa is for tourism or visit purposes, allowing foreign nationals to enter the US to visit their family or friends, engage in tourism, recreational activities, undergo medical treatment, etc.