Description:

Ghostscript is a set of software tools that provide a PostScript(TM)
interpreter, a set of C procedures (the Ghostscript library, which
implements the graphics capabilities in the PostScript language) and
an interpreter for Portable Document Format (PDF) files. Ghostscript
translates PostScript code into many common, bitmapped and vector
formats, like those understood by your printer or screen. Ghostscript
is normally used to display PostScript files and to print PostScript
files to non-PostScript printers.

You should install ghostscript if you need to display PostScript or
PDF files, or if you have a non-PostScript printer.