About PDF
How to Read & Save PDF Files:
Files published in portable document format (pdf) are read with the Adobe® Acrobat® Reader, available free of charge at adobe.com.
Once the Reader is installed on your machine, browsers can be configured to either:
Display pdf files in browser windows (the reader is said to work as a “plug-in”), or
Open new Reader windows and display pdfs there (the reader is said to work as a “helper application”).
For Adobe’s advice about Reader installation and browser configuration, see www.adobe.com/support/reader/.