"Chakra (also chakro) are points in the human body, i.e. major plexuses of arteries, veins and nerves, that are centres of life force (prana), or vital energy in Hindu metaphysical tradition and other belief systems. Texts and teachings present different numbers of chakras.
The concept of chakra features in tantric and yogic traditions of Hinduism and Buddhism."
Taken from http://en.wikipedia.org/wiki/Chakra
Explanation of Seven Chakras:
More to be added..