There are many portions or levels to your being. There is the physical level, of course, but there are also a number of other 'subtler' levels. There exist a variety of levels of consciousness, which people can train in to be able to access. Your aura is the collection of all these other 'subtle 'levels of your being, what I would call 'subtle bodies'. Each subtle body corresponds to some other higher level of consciousness and serves as your 'vehicle of awareness' on that level of consciousness. Most people have not sufficiently developed or activated or awoken their subtle bodies enough to be able to perceive onto those levels. Speaking more metaphorically, your aura is your soul made visible.
I will not defend any of that, nor am I trying to convince anyone of anything here. Believe/think/disbelief/whatever as you all wish. I started this thread so that people who can sense auras could talk with each other about what they sense and how, and share any notes they wished to. Others may not be able to contribute but would find it interesting reading nonetheless. This is a topic that many people find very interesting, but also one that generally isn't talked about in the open or during typical conversations, for a variety of reasons, so I hoped that by making this thread it would create a safe and open environment where people could talk and share.