The suffix PS is used for postscript files that represent a graphics format in the page description language postscript. A PS file, in contrast to Encapsulated Postscript files (with the extension eps) can also contain several pages. Also, PS files do not have to comply with the special requirements of the Adobe Document Structuring Conventions like eps files.
PS files are less for the import or export of graphics thought, it is used eps. Ps files are ultimately created for printing, while the main application of eps files or eps graphics is to be inserted into other PS documents.
PS files can contain any combination of text, images, fonts, or vector graphics. These elements can be described (vector graphics) or embedded (bitmap graphics). This makes PS a very versatile format and also has the advantage of scalability. Unlike eps files, PS files do not contain a thumbnail image.
PS files have the advantage of being output directly to a Postscript printer. Meanwhile, the PS format has been largely supplanted by other page layout file formats such as PDF.
But there are quite a few commercial as well as free programs that can read and create PS files. Some programs, such as Scribus and Irfanview need to import PS files in addition to the free Ghostscript interpreter, which then takes care of the processing of this data.