The OASIS (Ontologically Anthropocentric Sensory Immersive Simulation) is a virtual reality simulator accessible from every functional computer terminal on Earth. It was created by James Halliday, who built it initially as a massively multiplayer online game, but it evolved into a globally networked virtual reality world.
In the OASIS, you can be anyone you want to be, regardless of who you actually are. It's a place where the limits of reality—and your imagination—are your only constraints.
— James Halliday