section

A document section is a portion of a word processing document, such as a chapter, to which you can apply formatting different to the rest of the document. For example, a section can have different page numbering, background images, headers and footers and table of contents.

A word processing document is all one section unless you specifically add more sections to it.

In Page Thumbnails view, when you tap a page thumbnail and then tap it again, a yellow highlight appears behind all the pages in the same section.