Book
A book is an object recording information in the form of printed writing or images. Modern books are typically in codex format, composed of many pages bound together and protected by a cover. Older formats include the scroll and the tablet.
As a conceptual object, a book refers to a written work of substantial length, which may be distributed either physically or digitally as an electronic book (ebook). These works can be broadly classified into fiction (containing invented content, often narratives) and non-fiction (containing content intended as factual truth).