What Does Multi-User Domain Object Oriented (MOO) Mean?

Multi-user domain (MUD), object oriented (MOO) is a virtual reality system in which several users are connected at one time. Users from around the world log in to use this object-oriented database system, which is stored on a remote server.

MOO was originally designed to allow role-playing gamers to play text-based adventure games across computer networks. Since then, MOO has been adapted for educational and other purposes such as collaborative software development, distance education and conferencing.

Techopedia Explains Multi-User Domain Object Oriented (MOO)

MOOs are interactive systems that can be used to develop educational and other collaborative systems (software). These multi-user systems are programmable and can be accessed over a network.