Portable Document Format (PDF). It's a distribution format developed by Adobe Corporation to allow electronic information to be transferred between various types of computers. The software which allows this transfer is called Acrobat. In order to view and print a PDF file you will first need to download and install a copy of the Adobe Acrobat Reader. This is the most common form of ebook. Microsoft Word Document (DOC) comes with all of our products, and this is considered the editable source document that you can add your name, website url, email, or just about anything that you want to it, and then save it as an uneditiable PDF ebook to distribute to your clients, and/or subscribers. Microsoft Powerpoint Presentation (PPS). We create this file for you to enable broader distribution of the product, thus enabling you to reach more consumers, because not everyone is a PDF ebook fan. Some people are more reactive to a video style presentation, and this format gives them just that. We also give you the editable source PPS. If you do not have MS Office, you can get the free alternative at OpenOffice.org. Download our free document explaining Open Office in more detail - click here. Electronic Publication (EPUB). EPUB is the standard ebook format supported by almost every ebook reading device such asd Sony eReader, BeBook, IREX Reader, iPhone, Barnes and Noble Nook, and more. Amazon Kindle does not readily accept the EPUB format, but you can easily convert EPUB files into .AZW which is Amazons own format. A service to do this conversion is BookWorm.