Everything in existence is comprised of energy and this includes your Chakras.
Chakra is a Sanskrit word meaning wheel of light. Your Chakras are energy centers which translate the universal life force energy into an individual energetic emanation and experience.
You have seven major Chakras whose center points can be found at different locations along your spine and skull. Each of these seven Chakras are associated with, and influence, basically govern, certain physical organs, tissues and endocrine glands within your physical body.