ISBN (identifier)

ISBN stands for International Standard Book Number. It is a unique number that identifies every book that is printed and sold in the world. It’s a bit like having your own special number that only your book has. It helps us to find the exact book we are looking for, like if you go to the library and ask for a certain book, the library can use the ISBN number to find the one and only exact book you want in all the millions of books they have!