A tag is an object that can be assigned to any Subprocess. The difference from Categories is that multiple tags can be selected for each Subprocess. By adding a tag you add new possibilities of how to filter and export data.
Adding a new tag is done by simply entering the name and an optional description.
Tags can be used for grouping certain types of Subprocesses. For example, if you have certain subprocesses that are used for audit, you can create a tag called "Audit". You can then filter the dashboard to only show those certain processes - or export only subprocess with that tag in order to swiftly create a report to your auditors.