Postscript files are capable of holding quite a variety of information ranging from pictures to text documents to font definitions. Postscript files can be directly interpreted by many printers, and Postscript viewing software comes with many computers and can be obtained for free for most others. The most popular free Postscript viewer is called ghostscript and may be downloaded from many different FTP sites. In truth, Postscript is actually a full language, and Postscript files can perform all manner of things.