PDF, [Portable Document Format](http://en.wikipedia.org/wiki/Portable_Document_Format) is a file format created in 1993 by Adobe Systems.

PDF was meant to be Adobe's successor to [tag:postscript].

###Popular questions

- [Combining or merging PDF files in Windows](http://superuser.com/questions/34284/combine-merge-pdf-files-in-windows)
- [Converting .pdf to .eps](http://superuser.com/questions/182368/how-to-convert-pdf-to-eps-on-windows)
- [Changing the page ordering of a PDF document](http://superuser.com/questions/145534/how-to-change-page-order-of-a-pdf-file)
- [Converting Word document forms to PDF fill-in forms](http://superuser.com/questions/11703/converting-word-forms-to-pdf-fill-in-forms)
- [Stopping PDFs from loading/displaying inside Google Chrome](http://superuser.com/questions/30850/stop-pdfs-from-displaying-inside-google-chrome)


###Programs and applications

- [tag:adobe-reader]
- [tag:foxit-reader]