Dream SMP, which stands for Survival Multiplayer, is (according to its wiki page) a private, whitelisted Minecraft server played on mostly by the Dream Team.

Though it isn’t caught up to the current plot, the videos are a great way to learn the lore without having to go through every live stream up to this point. With more people being added and more ...

Tommyinnit and Dream have been going back and forth on the server for quite some time now, but it looks like that's all over. Tommyinnit is officially dead on the Dream SMP Server.