A J-1 visa is granted by the Department of State (formerly the U.S. Information Agency) to a foreign citizen who has been selected by a sponsor, such as a college, to participate in an exchange visitor program in the United States.
A J-1 student may stay in the United States until his/her academic program is completed. You may work on campus eighteen months after you graduate if your J-1 sponsor approves. You may bring family members if there is sufficient financial support. However, you should check with a U.S. consular office or the Department of State web site before requesting a J-1 status to see if you must return home immediately after completing your studies as is the requirement if you are funded by your home government, a U.S. government agency, or if your skills are in short supply in your country. The web site is http://www.state.gov/.