By 2035, MindLink, or VR2.0, was the most prevalent VR technology. It utilized a non-invasive BCI -- or brain-computer interface -- allowing users to directly control their avatars or game characters. Through this headset, all input to and from the user's brain was replaced, resulting in a world that appeared as real as reality itself.
Mindlink uses electrical impulses to modify brain signals, doing so it "transfers" the user to a world. One of these worlds being Aetheria Server.
VR was originally used to train American soldiers for warfare. Instead of sending soldiers staight off with no experience, they would use VR to give them some experience before they went in combat, giving them an advantage.
VR was then approved for commercial use: driver's ed, pilot school, and medical school. It was also used for gaming, and the Aetheria Server was one of the games made using VR.