What are the Deadmines in World of Warcraft

the deadmines is a beginner "instance" in world of warcraft. it is i small sub-map/server with NPC's you kill, they have a much higher HP/crit/def/att than normal NPC's you find on the map. the deadmines is a level 10+ instance located in westfall underneath a house. as alliance this is the first instance you will do in world of warcraft