Difference between Start later and Frequency

I was asking myself, which are the differences between Start later and Frequency in 9.6. The only difference for me was, at the start later section I can say a time and I can set up, which clients are affected (Devices that did not succeded, ...). In the Frequency section, I think the policy will applied again for all clients.

Could someone clarify this?

Thank you for your feedback.