The Diff module is primarily a tool to compare content revisions making it useful tool when administrating content publishing workflows. It also provides a general Diff Engine used by other modules to compare a variety of things.
As of Drupal 8.x, the core Diff Engine has been added to core to provide configuration comparisons.
Modules with Diff integration
|Features||-||Yes||-||Uses the DiffEngine to compare different features.|
|Revision Deletion||No||Yes||-||Compatible override of the revisions page.|
|Rules diff (sandbox)||No||No||Yes||Provides Rules integration.|