In this directory, you'll find some eBook files. In order to read these files, you will need one of many available ebook readers. They exist for all platforms. All ebook readers with the exception of Amazon's Kindle can read the .epub format. For Kindle you may use the .mobi format. Adding a book to your ebook reader can be done through the import function of your application. Sometimes this does not work. For example, the Kindle apps don't seem to provide an option to add your own books. In this case, you need to find the folder where all the ebooks are stored (the path is shown under "preferences" and can be changed) and simply copy your ebook into that folder. After having done so, restart the software. Some suggestions of eBook readers: Free Kindle reading apps: http://www.amazon.com/gp/feature.html/ref=sa_menu_karl3?ie=UTF8&docId=1000493771 Free reader of .epub files for the Mac: "Kitabu", which is available through the MacApp Store. Free reader of .epub files for Windows and Android: "FBreader", http://www.fbreader.org/win32