There are many types of visitor visa for the USA:
Visitor visa designed for visiting America for business purpose, business meetings or to participate in conferences and seminars.
Visitor visa designed for tourist visit to America, holiday or family and friends visit as well as traveling for medical care and treatment. This visa type also covers participating in sports, musical and cultural competitions as amateur i.e. unless the participant receives payment for participation.
If you wish to visit the USA for business purposes, to participate in meetings and conferences, tourist visit or to visit your friends and family as well as for medical care and treatment you need to apply for visitor visa.
This visa type has non-immigrant character.
You can get in touch with me and book an appointment every working day in my office or through Skype/Viber, but first you should fill out my questionnaire.