Question

header is a
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Answer 1

Answer:

A header or heading is text at the top of a page in an electronic document or hard copy

Explanation:

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Answer 2

A header is a separate bit of text at the top of a printed page. A header might be the title of the novel you're reading, which is repeated on each page of the book. One kind of header — also called a "page header" — is a chapter title, which is often printed at the top of every page.