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.
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after.png.b7373a88443173e4fd665be8a691c269.png.fc24a22aac50ec587ab74b5480ef4793.png.7f4932f969...png -
before.png.cc2cd6de05fcf35ed7006ac7939ca1aa.png.efcd749eb39a4c7b8cae6c8a189b10fc.png.0394f3e73...png
