Kundalini is an energy that exists in everyone's body, usually in a dormant state. This means that most people never feel it and never know it is there. But in a very few people, perhaps one in one thousand, this energy becomes aroused, activated. 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).