Shamanism is an indigenous term for ancient and modern-day spiritual healing practices. It is not about a religion. It is about accessing information from an altered state of consciousness for restoring the connection between people and the universe.
There have been Shamans in existence in all cultures, in all parts of the world for thousands of years. They have been the healers of civilizations who have accepted their commission, their calling, for aiding their fellow humans.
A Shaman will use various methods of healing to achieve this purpose. They journey to other dimensions/levels of consciousness to gather the information needed to treat the body, mind and spirit of the person for the realizing of wholeness and oneness.