PostScript

A page-description language developed by Adobe Systems, Inc., used when printing high-quality text and graphics.  Desk-top publishing or illustration programs that create PostScript output can print on any PostScript printer or image setter, because PostScript is hardware-independent.  An interpreter in the printer translates the PostScript commands into commands that the printer can understand.  This means that you can create your document and then take it to any print shop with a PostScript to make the final printed output.

PostScript uses English-like commands to scale outline fonts and control the page layout; because of this, users have a great deal of flexibility when it comes to font specification.