Books may also refer to works of literature, or a main division of such a work. In library and information science, a book is called a monograph, to distinguish it from serial periodicals such as magazines, journals, or newspapers. The body of all written works including books is literature. In novels and sometimes other types of books, a book may be divided into several large sections, also called books. An avid reader of books is a bibliophile or colloquially, bookworm. A set of text-filled or illustrated pages produced in electronic format is known as an electronic book, or e-book.