Hi Alex,
On latest dotCMS, actions such as Save, Save/Publish, Publish, Archive, so on! are handle by the System Workflow.
For instance when you go to the content editor in order to edit a contentlet and click on the button Save, dotCMS will fire the corresponding action associated to this functionality, in this case the Save Action.
That said, almost every action on dotCMS is management by workflows and the core actions on dotCMS are encapsulated on the System Workflow.
On community editions, you are able to use the System Workflow to perform the life cycle (create, edit, publish, unpublish, archive, delete, etc) over the contentlet and so on, but you need a license in order to add a new workflow or modified any existing one.
Thanks,
J