The .ps filename extension refers to files authored using the open postscript programming language. The postscript format was developed and first released by Adobe Systems in 1982. It is a dynamically typed object oriented page description language format with graphics primitives that make it appropriate for use in desktop publication workflows. The postscript format quickly became the default language driving high resolution laser printers used by prepress service bureaus because it is well suited to describing page layouts with great precision. Several applications both proprietary and open source can allow you to open postscript files, others such as PDF creator or Adobe distiller will convert the postscript file into a PDF file for viewing. Postscript file editing can also be done with simple text editors given the standard character set used in the language.