It's basically a text-based online space where users log in to converse in real time.
Users can also make objects, rooms, and write programs to extend and customize the space.
Okay, maybe not. Basically you telnet to some address and all of a sudden random strangers with funny names are spewing text at you and making jokes about cheese. MOOs with a ViEW A number of schools have started using MOOs in their classes. Some educators even got together and wrote an educational-based MOO core that can be accessed over the web. A facsimile of a social life I hang out on a number of MOOs, and I count MOOers among some of my friends and dear sweeties.