A single sheet within a book is called a leaf, and each side of a leaf is called a page. A book produced in electronic format is known as an electronic book (e-book).
The body of all written works including books is literature. In novels and sometimes other types of books (for example, biographies), a book may be divided into several large sections, also called books (Book 1, Book 2, Book 3, and so on). Books can also be borrowed from libraries.  Similarly, the Latin word codex, meaning a book in the modern sense (bound and with separate leaves), originally meant "block of wood".
 Papyrus sheets were glued together to form a scroll. The Greek word for papyrus as writing material (biblion) and book (biblos) come from the Phoenician port town Byblos, through which papyrus was exported to Greece.Whether made from papyrus, parchment, or paper, scrolls were the dominant form of book in the Hellenistic, Roman, Chinese, and Hebrew cultures. The more modern codex book format form took over the Roman world by late antiquity, but the scroll format persisted much longer in Asia.
In the 5th century, Isidore of Seville explained the relation between codex, book and scroll in his Etymologiae (VI.13): "A codex is composed of many books; a book is of one scroll. The tradition and style of the Roman Empire still dominated, but slowly the peculiar medieval book culture emerged.
Before the invention and adoption of the printing press, almost all books were copied by hand, which made books expensive and comparatively rare.
Calligraphers, who dealt in fine book production
Finally, the book was bound by the bookbinder.Irish monks introduced spacing between words in the 7th century. The first books used parchment or vellum (calf skin) for the pages. The book covers were made of wood and covered with leather. At first, books were copied mostly in monasteries, one at a time. With the rise of universities in the 13th century, the Manuscript culture of the time led to an increase in the demand for books, and a new system for copying books appeared. The books were divided into unbound leaves (pecia), which were lent out to different copyists, so the speed of book production was considerably increased. A number of cities in the medieval Islamic world had book production centers and book markets. The medieval Islamic world also used a method of reproducing reliable copies of a book in large quantities, known as check reading, in contrast to the traditional method of a single scribe producing only a single copy of a single manuscript. Modern paper books are printed on papers which are designed specifically for the publication of printed books. Typically, books papers are light weight papers 60 to 90 g/m² and often specified by their caliper/substance ratios (volume basis). This volume basis then allows the calculation of a books PPI (printed pages per inch) which is an important factor for the design of book jackets and the binding of the finished book. Different paper qualities are used as book paper depending on type of book: Machine finished coated papers, woodfree uncoated papers, coated fine papers and special fine papers are common paper grades.