The B-2 visa is a non-immigrant visa that allows foreign nationals to visit the United States for tourism, vacation, or medical treatment. It is typically granted for a period of up to six months, and holders can engage in leisure activities, visit family or friends, and receive medical care during their stay. To apply for a B-2 visa, individuals must demonstrate their intent to return to their home country after their visit. This includes providing evidence of ties to their home country, such as employment, property, or family connections. The application process involves filling out a form, paying a fee, and attending an interview at a U.S. embassy or consulate.