Astral Projection is a type of magic which allows the caster's soul to travel outside of its body, particularly in the Spirit World. This is white magic.
Specific Details
Astral projection is relatively simple. The caster enters a trance state, often with the aid of certain potions or herbs, and concentrates on withdrawing their awareness from their body. Smoke from the burning of herbs such as sage can act as a deterrent to lurking souls attempting to find a body.
Used By
Shamans
Shamans are the ultimate experts when it comes to the spirit world. They can communicate with spirits, see spirits, and are the best astral projectors in the world. A shaman's spirit guide will usually guard their body while the shaman astrally projects.
Others
Technically any soul with a body can attempt to project out of it. Magicians are simply far better at it.