A book is a written or printed work consisting of pages that are glued or sewn together along one side and bound inside a cover. Books can also be blank, comprising a set of sheets of paper held together inside a cover that users can write information on. The term “book” is also used to describe a main division of a literary work or of the Bible, the libretto of a musical or opera, or the script of a play. An ebook is written material in a digital format that can be read on various devices such as tablets, ereaders and smartphones.

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