Page layout is the part of graphic design that deals in the arrangement of visual elements on a page. It generally involves organizational principles of composition to achieve specific communication objectives.
The high-level page layout involves deciding on the overall arrangement of text and images, and possibly on the size or shape of the medium. It requires intelligence, sentience, and creativity, and is informed by culture, psychology, and what the document authors and editors wish to communicate and emphasize. Low-level pagination and typesetting are more mechanical processes. Given certain parameters - boundaries of text areas, the typeface, font size, and justification preference can be done in a straightforward way. Until desktop publishing became dominant, these processes were still done by people, but in modern publishing they are almost always automated. The result might be published as-is (as for a residential phone book interior) or might be tweaked by a graphic designer (as for a highly polished, expensive publication).
Beginning from early illuminated pages in hand-copied books of the Middle Ages and proceeding down to intricate modern magazine and catalog layouts, proper page design has long been a consideration in printed material. With print media, elements usually consist of type (text), images (pictures), and occasionally place-holder graphics for elements that are not printed with ink such as die/laser cutting, foil stamping or blind embossing.
With manuscripts, all of the elements are added by hand, so the creator can determine the layout directly as they create the work, perhaps with an advance sketch as a guide.
With ancient woodblock printing, all elements of the page were carved directly into wood, though later layout decisions might need to be made if the printing was transferred onto a larger work, such as a large piece of fabric, potentially with multiple block impressions.