The Free On-line Dictionary of Computing (30 December 2018):
Advanced Function Presentation
Advanced Function Printing
    (AFP) A page description language from
   IBM introduced in 1984 initially as Advanced Function
   Printing.  AFP was first developed for mainframes and then
   brought to minicomputers and workstations.  It is
   implemented on the various platforms by Print Services
   Facility (PSF) software, which generates the native IBM
   printer language, IPDS and, depending on the version,
   PostScript and LaserJet PCL as well.  IBM calls AFP a
   "printer architecture" rather than a page description
   language.