Tags are used to keep track of selected records by associating them with each other.
They are useful when some transaction(s) have not yet been processed and you can't reconcile the group yet
Tag are created on the Manual Reconciliation screen. Read more about the process here
You can view existing tags from the Reconcilations>Tags menu item
View the details of the tag by clicking on its name
Delete all Empty Tags will remove all tags that have don't have any unreconciled transactions linked to them