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

EMM386

    An expanded memory manager for IBM PCs
   with an Intel 80386 or higher processor, part of MS-DOS
   version 5.00 or higher.  EMM386 uses extended memory to
   simulate expanded memory and also provides upper memory
   blocks.  It must be loaded by a DEVICE= command in your
   CONFIG.SYS file.

   (1996-01-13)