What is ghostscript, why it is used? [closed]

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I want to know about the ghostscript? I have seen that it is required for few softwares like cute pdf etc. What it does actually? Why it is used?

Thanks in advance!!

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Ghostscript is a package of software that provides:

An interpreter for the PostScript (TM) 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; and 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.

Taken from Ghostscript