The aura is an energy that surrounds us. It acts like a magnet and attracts other energies, too (positive and negative).
All beings have an aura. If your aura is strong, it can protect you from the negative energies and actions of others.
The basic colors of the auras as the same as the colors of your chakras, representing the seven colors of the rainbow. These colors change as you change emotionally and spiritually. With some training, you can read others intentions by studying their auras.