ISBN stands for International Standard Book Number, a unique code of 13 Digits (Generally) that can be assigned to a book. It has standard from the late 90's and now has become a status symbol for authors all around the world.
Your book is now having a unique number which makes it's presence globally in the book market. It is mandatory to have ISBN for your book and also it is a positive tool that can act as a positive asset of your book at the time of internet marketing.
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