PDF

PDF is Adobe's proprietary "Portable Document Format". The format preserves the exact layout of text and images put in it while allowing device-independent display and printing.

Adobe provides a free reader ("Acrobat Reader") for the format, but charges significant money for the full "Acrobat" program which can write the format. FOSS programs such as OpenOffice can export in PDF format albeit not always perfectly. There are also FOSS programs available for reading PDF -- necessary especially in the Linux world, as Adobe does not provide Acrobat Reader for Linux.

The following FOSS applications are available for reading PDFs in Linux (and they all open faster than Acrobat Reader):

• xpdf (very bare-bones)
• kpdf
• KGhostView