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In typography and word processing, the page footer (or simply footer) of a printed page is a section located under the main text, or body. It is typically used as the space for the page number. In the earliest printed books it also contained the first words of the next page; in this case they preferred to place the page number in the page header, in the top margin. Because of the lack of a set standard, in modern times the header and footer are sometimes interchangeable. In some instances, there are elements of the header inserted into the footer, such as the book or chapter title, the name of the author or other information. In the publishing industry the page footer is traditionally known as the running foot, whereas the page header is the running head.