Does each copy of the same book share the same ISBN?

It is often the edition that is confusing to people. A paperback edition will have a different ISBN than a hardcover. Textbooks with revised content will get a different ISBN from the original edition. Children's Books packaged with a toy or doll will have a different ISBN than the book itself. This is so that buyers get exactly the book they want. Librarians will put the ISBN on the catalog information on the online catalog.