Documents stored as PDF ("Portable Document Format") files require a special viewer in order to open them. The
creator of the PDF format, Adobe Systems, offers their free Adobe Reader software:
♦ Adobe Reader
(for Windows, MacOS, Linux, mobile devices, and more)
There are other free software options that can be used to view PDF files. Their features are not as complete as
those of Adobe Reader, but they are much smaller in size and can be run from portable devices such as USB flash drives:
