A book is published once under a single title (with the possibility of updated editions published infrequently). Periodicals are newspapers, magazines, or academic journals that are published with a regular frequency, e.g., once a week, once a month, every three months, etc. Magazines are printed through a variety of different methods, depending on their size, number of images, colour scheme and various other factors. The two most common forms of printing are Digital and Lithographic, but there are other options out there too!