Working with post revisions
Apart from many content formatting features, WordPress also allows some basic version control for your posts. What this means is that WordPress keeps every subversion of your every post. Or in plain English, every time you press the Update button, instead of overwriting the previous version of your post, WordPress creates a completely new one. Although this feature doesn't seem like the most useful one at first, it's actually very important for sites where the content is managed by more than one person. In such a scenario, it's easy to get the newest versions of the posts mixed up, so it's always good to have the possibility to return to the previous one.
To take full advantage of this functionality, what you need ...
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