title_body: What is the different compatible formats between Kindle Paperwhite and Kindle Fire? More specifically, I would like to know why this eBook is not compatible with the Kindle Paperwhite.
  
  It says that it is a print-replica with the additional features given by X-ray which is compatible with the paperwhite.
  
  Why is it not compatible?
upvoted_answer: The book in question is a "Print Replica" textbook.  See how it says Networks: An Introduction [Print Replica] [Kindle Edition]?
  
  When we look up information about Print Replica:
  
  Kindle Textbooks:
  
  
    Kindle Print Replica textbooks maintain the rich formatting and layout of their print editions while also offering many of the advantages of standard Kindle books.
    
    Each page in a Print Replica textbook displays words and images in the same position as the corresponding print edition, while adding Kindle features such as annotations and the ability to sync your last page read across multiple Fire and Kindle devices and Kindle reading apps. Kindle Print Replica textbooks also have most of the same features as PDF-formatted books, including advanced zoom and pan functions.
    
    Kindle Print Replica textbooks are supported on:
  
  Kindle Fire
  Kindle Fire HD
  Kindle Fire HDX
  Fire HD
  Fire HDX
  Kindle for PC
  Kindle for Mac
  Kindle for iPad
  Kindle for iPhone
  Kindle for iPod touch
  Kindle for Android Tablet
  Kindle for Android Phone
  Kindle for Samsung Tablet
  
    
    Kindle Print Replica textbooks will have the words "Print Replica" next to the book title in the Kindle Store.
  
  
  Also, with regard to the "Look Inside" preview having adjustable text sizing, note the little FYI at the top of the previewer:
  
  
    Just so you know... This view is of the Kindle edition (2010) from
    Oxford University Press, USA. The Kindle Edition edition (2010) from
    OUP Oxford that you originally viewed is the one you'll receive if you
    click "Buy With 1-Click" on the left.
  
  
  So it looks like the preview is not of the same exact Kindle file that you'd be buying.
  
  I also downloaded the sample of that book onto my K4iOS app, and it's totally fixed layout, with margins containing notes and illustrations and stuff, while keeping the text fully searchable.  This kind of thing generally isn't supported on an e-ink reader.