What are sub pages in OneNote 2016?

Using Microsoft OneNote 2010 is similar to the experience of taking notes in a paper notebook, but it offers many features that are possible only in an electronic notebook. Like a paper notebook, your OneNote notebooks can be organized by multiple sections that let you categorize information by project, subject, location, and similar criteria. 

Each section holds one or more pages that hold information specific to that notebook section. Subpages are optional page designations that are displayed as indented page tabs. While they work just like regular pages, the visual indentation of their page tabs can make it easier for you to keep information separate when organizing information in parent/child format.

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