SEO Friendly Page Navigation
For example, when you link to content via a Category Blog Menu Link instead of via a Single Article Menu Link.
When you do, the Joomla! CMS will by default present buttons at the foot of each Article within the linked Category.
The buttons will labelled Previous and Next enable easy browsing of Articles within a given Category.
They are not however very helpful to search engines or humans.
Reason: they do not indicate what is in the next or previous Article.
Default Page Nav Buttons look like this
How to change Page Navigation settings
You can override this default setting via the Content - Page Navigation Plugin screen of your website's control panel.