A header is text that appears at the top of every page. It’s contained in a special, roped-off part of the page where you can place special text.

A footer is text that appears at the bottom of every page. Like the header, it has its own, special area and contains special text. You can use a header, a footer, or both:

Click the Insert tab and, from the Header & Footer group, click the Header button.

A list of preformatted headers is displayed.