Photon App Creation: App Type> Realtime or PUN?

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Hello, I use Playfab as backend, and in Playfab Photon integration tutorial it says create a Photon app, with a type of "Realtime".

However every tutorial in Youtube says to create a "PUN" type of Photon app.

What is the difference between "PUN" and "Realtime" app types? Which one to choose as a Photon app type: PUN or Realtime for Playfab integration?

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