Department of Homeland Security (DHS): 

The U.S. government department responsible for most areas of national security, including all areas related to foreign visitors in the U.S. Under its jurisdiction are three bureaus that handle the work previously done by the U.S. Immigration and Naturalization Service (INS). Foreign students come into contact with DHS at the ports of entry to the United States, through the SEVIS database, and when applying for nonimmigrant benefits, e.g., employment authorization.