FB2 or FictionBook is an XML based ebook format. FB2 is different than other eBook format as it uses only one XML file. The embedded images with eBook are also increased. It contains both metadata and plain texts at beginning. It places image at the end of the file. eBOOK readers render before opening any FB2 file.
AZW3 is an eBook file that is developed by Amazon. It is used in Amazon Kindles to view eBooks. Moreover it also supports some advanced features like HTML5 and CSS3. It is a proprietary tool that can be viewed only in Amazon eBook previewer or Amazon kindles.
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