A bot is a computer program that automatically retrieves or updates wiki pages when it is executed. In general, bots are used for repetitive maintenance tasks, whose volume and characteristics are too large to be performed manually by users.
Developing and executing bots is normally outside the role of normal users, requires programming experience and must be done in coordination with the wiki's admins.
By default, bot edits are hidden in Special:Recent changes.
The MassEditRegex extension
Extension:MassEditRegex provides an alternative way to perform mass edits using regular expressions, through a special page in the wiki. Only admins can normally use this extension.