Diff

Drupal has a built in revision system to detect changes in the versions of content. You need to enable it. You can look at the versions in order to return to a previous one.

I made some mistakes here on purpose..

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and made some changes in the title and body.

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The revison tab shows changes. If you want you can look at the previous versions by clicking the link.

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When clicking the button, the Diff module starts to work.. There are three kinds of views.

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First you have to check the configuration of the module. Enable the three layouts.
 

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and check the fields you want to use with Diff


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