Q: What is a PDF?

A: Adobe's Cross-platform Portable Document Format

Q: How do I open it?

A: Mac: double-click and it will open in Preview or Adobe Reader (which ever you have selected to be the default viewer for PDF's.
Windows: double-click to open it up in Adobe Reader.

Q: Where do I get Adober Reader?

A: Download Adobe Reader

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This is not constitute an endorsement or advertisement for Adobe—they just happen to make the most commonly used file format.

A .pdf is cross platform file that is read only—some files can have information entered into them then printed.