V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

JFIF
       JPEG File Interchange Format (JPEG)


The Free On-line Dictionary of Computing (30 December 2018):

JPEG File Interchange Format
JFIF

    (JFIF) The technical name for the file
   format better known as JPEG.  This term is used only when
   the difference between the JPEG file format and the JPEG image
   compression algorithm is crucial.

   (1998-02-10)