1 Answer

http://www.kb.iu.edu/data/aftt.html 

PDF (Portable Document Format) is a file format developed by Adobe as a means of distributing compact, platform-independent documents. It is superficially similar to HTML; a PDF document may contain images and text, as well as hyperlinks. However, as PDF is based on a variant of PostScript, each document is self-contained, packing text, graphics, and fonts into a single file.

You can use Adobe Acrobat to create PDF files, and you can view PDF files either with Adobe Reader (available from IUware for Indiana University students, faculty, and staff) or via a web browser with the PDF Viewer plug-in.

Additionally, Mac OS X offers built-in support for creating PDF files and includes a free application called Preview for viewing PDF files; see In Mac OS X, how do I convert a document to PDF?