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There are many different formats of e-books currently available, just as there are many different formats for image files (.jpg, .gif, .png, etc.)  If you know the format of your e-book, you can find the proper device and/or software to view it with.  Some of the most common are: .azw (Amazon Kindle), .kf8 (Kindle Fire), .iba (Apple iBook), .epub (Open source standard), .pdb (eReader), and .pdf (Adobe Portable Document Format).


Using the Formats

Format Devices Apps
.azw Kindle Native Kindle Software
iOS Kindle app
.epub Nook Native Nook Software
iOS Bluefire Reader app
.pdb Nook Native Nook Software
iOS NOOK app


What the heck is a DRM?  DRM stands for Digital Rights Management, and it is how content providers make sure we are using their materials within the terms of their license agreements.