Headers and footers refer to the text or data (such as slide number, page number, date, and so on) that you want to appear at the top or bottom of your slides, handouts, outlines, or notes pages. Instead of adding this type of information on every slide or page, you add it once using the Header and Footer dialog box in PowerPoint and have it apply to all your slides or pages. The following animation illustrates…
Source:Guide to headers and footers in PowerPoint
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