Ghostscript is a package of software that provides:

An interpreter for the PostScript language,
with the ability to convert PostScript language files
to many raster formats, view them on displays,
and print them on printers that don't have
PostScript language capability built in.

An interpreter for Portable Document Format (PDF) files,
with the same abilities.

The ability to convert PostScript language files
to PDF (with some limitations) and vice versa.

A set of C procedures (the Ghostscript library)
that implement the graphics and filtering
(data compression / decompression / conversion)
capabilities that appear as primitive operations
in the PostScript language and in PDF.

For information how to use Ghostscript see
/usr/share/ghostscript/%{version}/doc/Use.htm