Mutiplayer Testing: In blueprint object debugger, is "Standalone" same as "Client1"

Hello all, so I had a quick question. I’ve been having some issues with a 2D multiplayer game that I’m working on, and I’ve been running PIE with 2 Players, and when I look at my blueprints and try to debug specific game objects, I find that there are two different worlds. This is expected, as I expect to see “Listen Server” and “Client 1”. However, instead of seeing “Client 1” I see a world called “Standalone”. Can someone explain what this is? Is it the client running on the same “machine” as the server? Or is it the same as a client?

Sorry, kinda new to this. Any help is appreciated.