Ghostscript can be used as:

Ghostscript is an interpreter and renderer, not a Line Printer Daemon (LPD) itself, which manages print queues.

Ghostscript's core functionality involves interpreting PostScript language and converting it into various raster image formats, making it a crucial print filter for enabling non-PostScript printers to print PostScript documents that do not natively support the language.

Ghostscript is generally used for non-PostScript printers; PostScript printers natively understand PostScript data and do not need Ghostscript to allow correct printing.

Ghostscript is not designed to fix physical printing artifacts like 'ghosting' or 'staircase' effects, which are typically hardware or driver issues.

While Ghostscript provides a display capability, its primary and most significant role, especially in the context of print systems, is conversion for printing.