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In typography, a page header (or simply header) is text that is separated from the main body of text and appears at the top of a printed page. Word processing programs usually provide for the creation and maintenance of page headers, which are often the same from page to page, with merely small differences in information, such as page number.
In publishing and certain types of academic writing, a running header or running headline is a header that appears on each page. Typical running heads in a book might consist of the book title on the left-hand (verso) page, and the chapter title on the right-hand (recto) page, or chapter title on the verso and subsection title on the recto. In academic writing, the running head usually contains a page number and the author's last name or an abbreviated version of the title.