Adobe Portable Document Format  (PDF) is the standard for electronic document distribution worldwide. Adobe PDF is a universal file format that preserves all the fonts, formatting, graphics, and color of any source document, regardless of the application and platform used to create it.

Adobe PDF files are compact and can be shared, viewed, and navigated  by anyone with free software. PDF files are the most universal file format and can be read on any computer with any operating system. Most regular computer users already have Abobe's acrobat reader installed and the reader is integrated into web browsers.

The ebook reader is an adaptation of the standard acrobat reader that can be used on most computers and special versions are available for compact and hand held computers. According to Adobe, " Acrobat eBook Reader is the ultimate way to view the growing number of eBooks in the marketplace today. Acrobat eBook Reader combines a vivid  reading experience with an easy-to-use, intuitive interface and features you won't find anywhere else. It's easy to download the free software — just select the Windows or Macintosh version.

For all Macintosh computers, order Acrobat PDF files. For Palm OS hand-helds you can try pdf files but compatibility is not certain. You need sufficient memory storage, the most recent OS, and the latest version of the Abode reader for Palm OS.