What does the book number refer to?

ISBN is a "birth certificate" of a book, which means that the book has been published and approved by the publishing house and publishing supervision department.

winning the book number means that your work has been successfully turned into a publication and can be released to the public.

from the appearance, the book number is composed of a group of numbers and bar codes, but its meaning is not just a series of numbers, it is the proof of the identity and copyright law of the book. Books with (regular) ISBN are protected by international copyright conventions.

application and classification of ISBN

ISBN is applied by the publishing house to the national publishing management department, and individuals cannot apply. Individuals who want to publish a book can only get the book number through the publishing house. All the regular ISBN numbers are controlled by the publishing house, and the authors who publish books at their own expense need to pay a certain ISBN management fee to the publishing house before they can apply for the ISBN number to publish books.

ISBN is divided into single ISBN and series ISBN, and also into paper ISBN and e-book ISBN.

above content reference: Baidu Encyclopedia-ISBN