Grant Pierce

Sure, I'll explain.

I was working on a project where users could change their profile data, but the changes were emailed to administrators for approval.

This code highlights the changes so the administrators can easily see what was changed. Much like a "diff" view in most source control tools.

Does that help? Or did you mean for me to explain how the code works?

That's true, very good point. This can be "good enough" in a lot of cases, but if you need a more fine-tuned diff, the code will have to be modified to fit your needs.