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.