What is the difference between Photon Server and Photon Cloud?

Photon Server is a On-Premises server application that you can run and host on machines of your choice In Photon Cloud You can completely concentrate on your application client while hosting, server operations and scaling is all taken care of by Exit Games.

https://doc.photonengine.com/en-us/realtime/current/getting-started/onpremises-or-saas