Digital editions of books are rapidly gaining popularity. While some people still find it preferable to use hard-copy, more and more people move to eBooks in favor of added functionality and usability. When it comes to a book you own, it is nice to be able to commit your thoughts on to it. Highlighting, scribbling, commenting or making notes on your copy allows a more personalized feel to your books. And it makes reference a lot easier. Unlike in printed books, the original text is not ruined by user edits on a soft-copy. Such data introduced by the user are referred to as "annotations". They are actually an overlay of information over the book print.
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