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Undo is an interaction technique which is implemented in many computer programs. It erases the last change done to the document, reverting it to an older state. In some more advanced programs, such as graphic processing, undo will negate the last command done to the file being edited.
In software development (and, by extension, in content-editing environments, especially wikis, that make use of the software development process of revision control), reversion or reverting is the abandonment of one or more recent changes in favor of a return to a previous version of the material at hand (typically software source code in the context of application development; HTML, CSS or ...
When you have decided to revert, please consider whether you will use the undo link in the page history, or revert manually. If you use the undo link, the editors whose edits you revert will receive a notification (if they have requested notification of reversions).
Logged-in users will also see a "Revert" link for versions other than the current one. Click on a Revert link to make the change. If the image is at Wikimedia Commons you must click through to the image page there to do the revert. Then scroll down to the thumbnails. Beside the thumbnail you wish there will be the word "Revert".
To revert edits by banned or blocked users in defiance of their block or ban (but be prepared to explain this use of rollback when asked to) To revert widespread edits (by a misguided editor or malfunctioning bot) unhelpful to the encyclopedia, provided that you supply an explanation in an appropriate location, such as at the relevant talk page ...
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They currently work the same way, but this lets them tell Wikipedia's servers "Please revert edit(s) by User:xxxxxx on article yyyyyy" instead of "Give me the list of changes for article yyyyyy.", "Ok, now give me the data for revision zzzzzzzz on article yyyyyy." "Ok, now give me the edit form for article yyyyyy."
Do not revert a large edit because much of it is bad, and you do not have time to rewrite the whole thing. Instead, find even a bit of the edit that is not objectionable and undo the rest. (To do this, you can use the "undo" button, then type or copy back in what you want to keep). If a supporter of the reverted edit wants to save more of it ...