1. VW4
2. Comparing Edits of a Page

On the History tab, the radio buttons next to each edit allow users to select different edits for comparison. After selecting two edits, click the "Compare Versions" button to see how much changed between them.

This will show you the raw source text of the edits you selected. The text may be separated into several blocks.

Blocks labeled with - indicate text that was removed between two versions.
Blocks labeled with + indicate text that was added between two versions.

The controls on this page allow you to navigate between comparisons of older or newer versions or switch to the current version of the article.

You may also see other controls for leaving reputation, reporting problems to moderators, reversing the change, or outright removing it from the history. The availability of each option depends on the user's permissions.