What does multiturn mean in the context of the rasa sdk?

saw it in the rasa sdk but not sure what id does? I got the custom actions to work but there is another step for it?

Rasa actions returns a single response and doesn’t allow you to have followups without changing the policy

We have the CoCoContextPolicy for this which has higher priority than the learned policies and knows how to override other policies when conversational components needs a followup responses