I made an experiment there and I asked a "chat gpt like" entity thats in nostr, but It seems like its down at the moment. In any ways, Nostr client is the portal you use to access nostr.

for example, Im using Primal.net ... but there are many, I imagine you are using one of them yourself.

I dont know if the correct definitio nis "portal" but its the best way I can frame it. Thats why I asked cyborg to see what it says about it!

Good luck in the rest of your day dear friend.