Regarding terminology: What is a simulation in the context of the simulation argument? Is there an example of a simulation which has been confused for the act

Regarding terminology: What is a simulation in the context of the simulation argument? Is there an example of a simulation which has been confused for the actual? How does that confusion arise? What's the connection between computation and simulation? Like a video game? Have you ever wondered how all those little people live inside your TV? Have you ever met anyone who has? Is the idea about a brain in a vat? Is the escape about something like the brain figuring out how to jiggle to cause the vat to fall from its shelf? How is the skull like a vat? Is the body a simulator for the brain? Or is the brain a simulator for the world? What does outside mean when it comes to "escape"? Is it like outside the universe? Are these semantic oddities limits of the simulator? Can the simulator be improved? Say with proper religious practice, or special exercise? Is the simulator simulated? Wait, what's a simulation again? What were things like before you were born? Is this what escape is like? So when you make your escape...