In Sanskrit cakram means wheel or circle. Although in Hindu religion it can just mean a circle of worshippers, Chakra usually refers to specific energy centres within the human body. Chakras are so called because as they normally revolve within the human energy system, and they do, they look like wheels.
Theoretically there are seven chakras, six of which are located along the spinal column and the seventh of which exists above the top of the skull, however those who say that they can to see the Chakras state that they reside somewhat inside the body and are related to various endocrine glands that exist separate from the spine and spinal ganglia.
In the Indian tradition of Kundalini Yoga the energy that pervades the universe also resides dormant in man at the base of the spine seated in the sacrum bone. When this energy is awakened by yogic practice, it rises up the spine stimulating and cleansing each chakra on its way. The awakening of each Chakra is accompanied by spiritual knowledge, a greater understanding of oneself and one's role in the universe and sometimes by mystical visions and states.
The first chakra, the Mooladhara is located between the genitals and the anus below the sacrum, and its main aspect is innocence. The next chakra above this is the Swadishthan at the level of the abdomen. This second chakra is the chakra of creativity, pure attention and pure knowledge. It connects us to our inner inspiration, and enables us to experience beauty in the world. The third, Nabhi Chakra, is the one that gives us the sense of generosity, complete satisfaction and contentment. The Heart Chakra or Anahat Chakra, in the centre of the chest, is the place where our Spirit resides, our true Self, which is eternally pure and unaffected by anything, a witnesses all our actions. The Vishuddhi Chakra, the fifth chakra the bottom of the throat is the chakra of diplomacy, of pure relationships with others, and of playful detachment. The Agnya Chakra, the sixth chakra located in the forehead just above the eyes is the chakra of forgiveness and compassion. Finally, the Sahasrara Chakra situated above the head is said to be the dwelling place of the god Shiva. This integrates all the chakras with their respective qualities. It is said to be the last milestone of the evolution of human awareness.