B2 visa is a tourist visa in America. If you want to travel for a vacation to USA then you need to apply for the USA B2 Visa application. Initially you need to get the application form in a counsel, but later on you can get the application form for free in a website.
There are minor eligibilities which you need to fulfill in case to go to USA for a vacation. Along with the form you have to submit some of the documents which prove your identity and an itinerary of the trip. This is to validate your personal identification and the purpose of the visit.
Along with submitting your application you need to provide your signature copy of the B2 Visa form. An itinerary of the trip you are going to. Your visa will be rejected without the details of the trip. Also most important of all is you need to show through your documents that you are going to stay there on a temporary basis.