Post Script is a languange that was developed by Adobe in 1984.It is used to describe the graphical content within a page as well as define the graphical appearance for screen and print.Before the introduction of PostScript,pages that had text images were manually assembled and photographed on a paste-up board and later sent for print.
The introdution of PostScript by Adobe ,has made prodution of high quality pages with text and images possible as well as compatible with several devices and operating systems,since it uses a standard format.For example, A PostScript file with a .ps extension opened with Adobe Acrobat,appears exactly same when viewed on different platforms.