In contemporary publication design, a folio is the printed page number. Its position, typography, numbering system, and relationship to running heads help readers navigate books and magazines.
A print run records how many physical copies are produced in one printing event. Here is how that quantity affects inventory, availability, production, and publishing risk.
A periodical is an ongoing publication released as separate, identifiable issues. Here is how recurrence, numbering, editorial structure, and design define the form.
ISBNs identify specific books and other finite monographic publications, while ISSNs identify continuing titles such as magazines, journals, and newspapers. Here is how to choose between them—and when a publication may use both.