The logic behind new game instances?

I’m incredibly confused and need it explained to me like I’m 5, I don’t understand how you’d setup a separate server instance (with a different map) in a game that is away from the main server/map, and then allow that player to leave that instance and return to the server they were previously in.

I’m having trouble understanding the logic behind it such as:

  • Do I build the map for whatever the Instance may be, then put it somewhere?
  • How do I interact with those separate instances (such as teleporting a player to it when they reach a door)

Documentation would be super helpful, or a quick explanation. Thank you!

Wait what? You joined roblox in 2008 and you’re 5 in 2024? That makes no sense.

(I could had missunderstood something)

Edit: Yeah I missunderstood what you said: