A textbook is a manual of instruction or a standard book in any branch of study. They are produced according to the demand of educational institutions. Although most textbooks are only published in printed format, many are now available as online electronic –books, or e-books. History Texts specifically designated for educational purposes were written in ancient Greece. The modern textbook has its roots in the standardization made possible by the printing press. Johann Gutenberg himself… (More on Textbook)