What is the difference between an I-20 and a DS-2019 form?
An I-20 is a certificate for F-1 applicants in which the school declares that you’ve been accepted for a full course of study and you seem to be a bona fide student. The DS-2019 form serves similar purpose for J-1 applicants who receive grants or special status from either from their government (i.e. Russian) or the US government directly or through non-governmental placement organization. Both forms should be registered in SEVIS.