The acronym, MUD, means Multi-User-Dungeon. MUDs are based in the classic tabletop game AD&D (AKA Advanced Dungeons and Dragons.) A MUD Client is a program that allows you to connect to a remote server for the purpose of playing a text based RPG. I have been involved in MUDing for almost a year now, and have made many friends, and even a few enemies. If you are interesting in getting involved in playing MUDs, you may be able to connect through Arrant Destiny.