Help:Diff

What is a diff? (Natalia/Sandister)
A diff, short for difference, displays the changes between two versions of a page.

The platforms in the wiki ecosystem have several versions of a Diff depending on which device and installation of Mediawiki is being used.

How to navigate to view a diff? How to test this in a sandbox? (George/Leon)
One way users can find an example of a diff is by navigating to the History of a given page and selecting two versions to compare.

What's the history of the diff?
Why would we use a diff view? (History)

Exceptionally good examples of documentation

 * https://www.mediawiki.org/wiki/Help:Extension:Media_Viewer
 * External: https://stripe.com/docs/billing/subscriptions/overview

Tips for documentation writing in general
https://www.mediawiki.org/wiki/Documentation/Style_guide