The aura is essentially one’s field of energy around their physical being. As heat waves can often be seen vibrating off pavement, aura’s work in similar ways. They radiate from the human body and for the most part, are unable to be seen, unless by someone skilled at looking for and noticing them. Whether by a skilled practitioner or someone whom was born naturally able to see them.
The aura is made of pure energy, fueled by the atoms in the cellular structure of the human body, and can radiate anywhere from an inch or so upwards to a few feet depending on how healthy (or clean) one’s energetic system is.