A Shaman is someone who has dedicated themselves to the practices of Shamanism and gained some mastery. Shamans are more than mere practitioners of nature based magic, they confer with spirits and commune with nature, and guide others in their interactions with nature and the spirit world. Shaman literally translates to "medicine man", (that doesn't mean women can't be Shamans either) they use their connection with nature, and the spirit world for healing. Shamans use to be highly respected people found all over the world, but now the way of Shamanism is only respected by Shamans, and other magick practionars.
Relation to therianthropy
Shaman are known to have animal spirits possess them or alter their state on conscience to that of an animal one. Which is probably why they are so popular in the therian community.