Quote:
Originally Posted by salamanderjuice
The main reason they exist is to uniquely identify a book and the edition. That's still needed for ebooks.
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In a physical shop for a physical book. Hence titles using KDP have an ASIN but may not have an ISBN.
Oddly an ISBN is totally optional for an ebook, which is why the major stores with direct SP have their own ID system, because in most countries the ISBNs have to be paid for. An Amazon Kindle ASIN or a Kobo eBook ID is free.
Actual publishers, or people Self Publishing everywhere will use real ISBNs. Unless an ebook is only in one store and ISBN is the best solution.