Question

how is a footer useful?

Answer 1

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Headers and Footers are used for automatically putting things on every page on a document or on alternating pages, without having to put them in page by page. Using Headers and Footers you can put other things automatically for every page, like the date or the time, or the author of the document.

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Answer 2

Answer:

footers are used for automatically putting things on every page of document or on alternating pages without having to put them in page by page.