What is Kundalini?
The untapped source of raw energy that lies within you.
The Sanskrit word, kundalini, means coiled, like a snake. Kundalini energy is not recognized by medical science, and is often little understood even among teachers of Yoga and meditative traditions. It is, however, mentioned extensively in the literature of Yoga and Tantra (both Buddhist and Hindu).
Because the word “kundalini” has become widely used, many people, I believe, consider it to be metaphoric or legendary. This statement by Yogi Bhajan, for example, suggests a somewhat metaphoric view of kundalini: “(Kundalini is) the creative potential in the man.” (Kundalini, Evolution and Enlightenment, edited by John White, Paragon House, 1990, p. 25) Yet those like me, who have aroused their kundalini, cannot possibly consider it to be a metaphor. It is quite literal.

“You are one thing only. You are a Divine Being. An all-powerful Creator. You are a Deity in jeans and a t-shirt, and within you dwells the infinite wisdom of the ages and the sacred creative force of All that is, will be and ever was.” ― Anthon St. Maarten