I’m not super knowledgeable with how it works, but it is essentially a system for seamless jumps between multiple servers “meshing” them together so there is zero noticeable lag time between them. There isn’t a single loading screen going across multiple star systems, which is a pretty significant achievement, especially given how detailed the game itself is.

I’ve never played World of Warcraft or really any MMO, but it is my understanding that there are areas to load into new places (a short black screen on entering a building, a “portal” to another zone, etc.).