The aura is a field of
energy surrounding the human body which can be both seen and felt by those who have attuned to its higher vibrational frequency.
It has seven layers, each one emanating from a specific chakra and coloured by the quality of energy in that chakra.
The more sensitive you become, the more layers you will be able to see. The first layer is the etheric field which extends about an inch of so around the body. It is the densest level of energy and probably the first level that you are likey to see when you begin your exploration.