What is a header and footer used for?
The Header and Footer feature is used to insert document information such as name, number, date, and even mages. Header is a field that allows you to place text at the top of the page, while Footer allows you to place text at the bottom of the page.  In Publisher, the content of the header will appear at the top of each page associated with the master page, while the content of the header will appear at the bottom of each page associated with the master page.