The J-1 Visa category "Intern" and "Trainee" was established by the Mutual Educational and Cultural Exchange Act of 1961 to promote the foreign policy objectives of mutual understanding between the people of the United States and other countries, through educational and cultural activities.
A J-1 visa is a non-immigrant visa issued by the United States to exchange visitors participating in programs that promote cultural exchange.
Applicants must meet eligibility criteria and be sponsored either by a private sector or government program.
http://www.internationaltrainee.com/