Auras consist of the electrical energy that swirls around each of us. That can be scientifically proven. Everything has a field around them, everything emits a certain amount of energy. So yeah, we do have auras.
On the un-scientific side (lol), many will say that auras have different colors which can be related to chakras, moods, and health issues. I personally, can’t see auras, so I haven’t discovered what all of the colors represent, but you can apparently learn how to see them. They make books on the topic that you can find at a Barnes & Noble or Borders.