Bureaucrats are administrators who have the additional ability to create new administrators. Bureaucrats are also elected by the community of Wikipedia users.
Rollbackers are users who have the ability to quickly revert vandalism and other disruptive edits. Rollbackers are appointed by administrators.
Editors are users who have the ability to edit pages on Wikipedia. All registered users of Wikipedia are editors.
Commentators are users who have the ability to add comments to talk pages. All registered users of Wikipedia are commentators.
Readers are users who do not have the ability to edit or comment on pages, but can still read them. All visitors to Wikipedia are readers.
In addition to these groups, there are also a number of other users who contribute to Wikipedia in various ways. These include:
* Bots are automated accounts that perform repetitive tasks, such as updating statistics and fixing formatting errors.
* Spam fighters are users who help to identify and remove spam from Wikipedia.
* Vandal fighters are users who help to revert vandalism and other disruptive edits.
* Translation coordinators are users who help to coordinate the translation of Wikipedia articles into different languages.
* Proofreaders are users who help to check the accuracy of Wikipedia articles.
* Wikipedians in residence are volunteers who work with organizations to provide Wikipedia training and support.
The contributions of all of these users help to make Wikipedia the free encyclopedia that it is today.