Final answer:
In word processing, a header is the title at the top of every page, and it can include elements like the document title or chapter name.A header is the title that appears at the top of every page in a word processing document.
Step-by-step explanation:
In a word processing document, the title that appears at the top of every page is known as a header. A header can contain information such as the document title, chapter name, page number, or the author's name. This feature is used to provide readers with context and to help with the navigation of the document. Unlike a header, a footer appears at the bottom of every page, and it can also contain similar information.
An important aspect of the header is that it maintains consistency across pages, contributing to a professional and organized appearance of the document. Headings within the content, such as a centered, boldface heading, typically mark the start of a new section or chapter, but are not repeated on every page like headers.