Pretty much what it says in the name - this will highlight the differences between edits made by users, as long as you have the 'Edit log' setting set to store the edits.
PHP requirements: v7.3 or later
See the following for the background:
See the 'Additional information' for support details.
This application makes use of Caxy Interactive's 'PHP-HTMLDIFF' library, which is available for use under the GNU GENERAL PUBLIC LICENSE (version 2). No modifications have been made to the source code of this library