Source : Free On-Line Dictionary of Computing

Advanced Function Presentation
     
         (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.