The "ring" of book binding refers to the lining pages that connect the cover and the core of the book. "Ring lining" is the abbreviation of "link lining", which refers to a thick paper folded in half into a double page lining, which can be linked together with the inner cover. Ringlining is an essential part of hardcover and cable paperback books.

The composition of book binding

Envelope - outer packaging, which protects the book.

Cover - decorate and protect the cover.

Cover - the face of the book, divided into front cover and back cover.

Spine - the backbone of the book between the front and back covers.

Lining - the lining that connects the cover and the body of the book.

Blank page - signature page - decorative page.

Information page - graphic information and textual information related to books.

Title page - the title page - the text begins from here.

Foreword - including preface, editor's words, and publication instructions.

Postscript - postscript and postscript.

Contents page - has an index function, and is mostly arranged with the titles and page numbers of chapters, chapters, and sections after the preface and before the main text.

Copyright page - including the book title, publishing unit, author, format, printing quantity, price and other copyright-related pages.

Block of the book - including lining, title page, inner pages, illustration page, table of contents page, copyright page, etc.