Auras

The aura is the energy field that surrounds the human body and all life forms. It consists of seven layers which are connected to the seven chakras. Our aura can read the auric field of another person or an object. The aura provides us with information on an intuitive level. The aura changes from moment to moment depending on our thoughts and how we are feeling.
We all have what can be described as a base colour which connects to our personality. The other colours that are a part of the aura are constantly changing, again, depending how you are feeling and what type of thoughts you are having.
The different layers of the aura:
The Physical Plane:
The etheric body is the layer closest to the physical body. It is an exact copy of the physical body and includes all the organs and systems of the body. It vibrates at a higher rate than the physical body which makes it invisible to most people. It can be seen as a light blue or greyish mist emanating up to two inches from the physical body. The etheric body connects to the Base Chakra.
The emotional body extends from the physical body by one to three inches. It reflects the inner feelings and emotions that we have. This layer does not duplicate the body but is more fluid and appears like soft coloured clouds in continual motion. This is the layer most described by aura readers. The emotional body connects to the Sacral Chakra.
The mental body is the third layer of the aura and is associated with the mental processes, knowledge and personal power. The colour of this layer is mainly yellow and will appear stronger and pulsate when the person is concentrating on mental tasks. It extends from three to eight inches from the physical body and connects to the Solar Plexus chakra.
Astral Plane:
The astral body is the fourth layer of the aura and connects the lower three layers with the higher three layers. This layer is about unconditional love and is associated with expression on a physical, emotional and mental level. It is shapeless and made up of clouds of bright colours and can extend out between one to one and a half feet beyond the physical body and connects to the Heart Chakra.
Spiritual Plane:
The etheric template body is the fifth layer of the aura, it is connected to higher consciousness and divine will. It is associated with the throat chakra and is connected to communication and creativity, speaking our truth willingly and living accordingly. It extends out between one and a half feet to two feet from the body.
The celestial body is the sixth layer of the aura and extends out between two to three feet away from the body and reflects our subconscious mind. It is where the physical mind connects to the spiritual mind through meditation. It is connected to the third eye chakra and is composed of pastel colours with a pale golden shimmer.
The causal body (ketheric template) is the seventh and last layer of the aura. It extends up to about three to five feet away from the physical body depending on the person’s spiritual state. The outer edge of this layer forms an egg shaped cocoon which protects and holds all other layers of the aura together. This layer also contains the blueprint of our spiritual path, reflecting all of the soul’s experiences through time. The causal layer is connected to the crown chakra and is the link to divine source within each person.

Chakras

The word chakra comes from the ancient Sanskrit language and it means wheel. There are many chakras around the body but we will only be dealing with the seven main chakras. The chakras are vortices of energy that with the exception of the root and crown chakras are situated along the front of the body. Each chakra is attached to the central energy channel, the sushumna nadi, which runs up the body from the coccyx up to the top of the head.

The outer part of the chakra is often seen as a funnel of light filled with whirlpools of light. They have an inward flow of energy while at the same time an outward flow while they are interacting with other people or situations. Chakras can become blocked sometimes which affects the flow of energy and can affect our health.

The following is a brief description of each of the seven main chakras:
Base or Root chakra ~ this chakra is located at the base of the spine near the tip of the tailbone. It extends downwards toward the Earth. It is linked with the colour red and its main functions are physical survival and the will to live, stability, practicality and energy distribution. The base chakra is linked to the adrenal glands.
Sacral chakra ~ this chakra is located just below the naval. Its colour is orange and its functions are creativity, feelings, sexuality, reproduction and the enjoyment of life. The sacral chakra is linked to the gonads.
Solar Plexus chakra ~ this chakra is located just below the sternum, near the diaphragm. Its colour is yellow and it is involved with self-expression, taking action in the world, self-confidence and personal power. The solar plexus chakra is linked to the pancreas and spleen.
Heart chakra ~ this chakra is located in the centre of the chest. Its colour is green and it is involved with all aspects of love, joy, compassion, personal development, direction and sharing. The heart chakra is linked to the heart and the thymus gland.
Throat chakra ~ this chakra is located in the throat area. Its colour is blue and it is concerned with all kinds of communication, personal expression, especially through singing, song writing or poetry and the flow of information. The throat chakra is linked to the thyroid glands.
Third eye chakra ~ this chakra is located between the eyebrows. Its colour is indigo and it is concerned with clairvoyance, inner vision, perception, understanding, knowledge and mental organization. It is linked to the pineal or pituitary gland.
The crown chakra ~ this chakra is located at the top of the head pointing upwards. Its colour is violet and it maintains overall balance of the chakra system. It channels universal life energy into the system. It is involved with intuition, inspiration, fine levels of perception. It connects to the spiritual realms and the higher self. The crown chakra is linked to the pituitary or pineal gland.
This is just a basic description of the chakras and I would recommend reading more about them.  http://psychicdevelopment.webs.com/aurasandchakras.htm