An aura is an energy field that surrounds the body and contains electro magnetic energy amongst other ethereal properties, when seen with the naked it eye it can look like a white misty outline and is more noticeable around the head and shoulders. Not only do we have an aura but every material object has an aura, animals, trees, rocks etc. Auras can vary in texture, quality, and feel in relation to the vibrational nature of each individual and aura is constantly changing from moment to moment as we change and develop.
By looking at a persons aura we can see many things about that person, their state of health, mood, energy levels and even what they are thinking via thought forms. Thought forms are created when we think and are expanded out into the aura and can sometimes be seen by looking at the aura, from my experience of looking at auras and seeing thought forms, thought forms tend to manifest themselves as images rather than words, for example lets say someone was thinking about a drink then you may see an image of a cup appear, this can also be the same if the person is thirsty, these images are also a white misty colour. With practice you can even tell if someone is lying to you as their thought forms won't be consistent with what they are telling you. We cannot fake the aura, it shows our true colours and intentions, hence the saying "showing your true colours".
Our auras can affect us and we can affect are auras, if our aura is imbalanced in some way then this can effect our mood, health energy levels etc and things we do or certain coloured clothes we wear can affect our auras, so by looking at auras we can discover and balance out any imbalances that our auras have.