The Activity Log in [Monday.com](http://Monday.com) keeps track of all the changes made to an item or board. If you're looking to undo a specific action, you can access the Activity Log by clicking on the "Updates" tab within an item or board. From there, you can scroll through the log and find the action you want to undo. Once you've located the action, click on the three-dot menu next to it and select "Undo" to revert the change.