Want to Understand about LoadBalancingClient

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Hi, I'm new to multiplayer and I need to know what is load balancing client and what is difference between _loadBalancingClient.OpJoinOrCreateRoom(); and PhotonNetwork.JoinOrCreateRoom()??


if Possible please help me understand what in photon Realtime and Pun? Can i use both in my project or when to use realtime and when to use pun?

Thanks in Advance.