Kundalini (Sanskrit kuṇḍalinī, कुण्डलिनी, pronunciation , "coiled one"), in the concept of Dharma, refers to a form of primal energy (or shakti) said to be located at the base of the spine. Different spiritual traditions teach methods of "awakening" kundalini for the purpose of reaching spiritual enlightenment and a range of supernormal powers. Kundalini is usually described as lying "coiled" at the base of the spine, represented as either a goddess or sleeping serpent whose energy is waiting to be awakened. In modern commentaries, Kundalini has been called an unconscious, instinctive or libidinal force, or "mother energy or intelligence of complete maturation".
Kundalini awakening is said to result from deep meditation, and consequently enlightenment and bliss. This awakening involves the Kundalini physically moving up the central channel to reach within the Sahasrara Chakra at the top of the head. Many systems of yoga focus on awakening Kundalini through meditation, pranayama breathing, the practice of asana and chanting of mantras. In physical terms, the Kundalini experience is frequently reported to be a feeling of electric current running along the spine.
The concept of Kundalini is mentioned in the Upanishads (9th century BCE - 3rd century BCE). The Sanskrit adjective kuṇḍalin means "circular, annular". It is mentioned as a noun for "snake" (in the sense "coiled", as in "forming ringlets") in the 12th-century Rajatarangini chronicle (I.2). Kuṇḍa (a noun meaning "bowl, water-pot" is found as the name of a Naga in Mahabharata 1.4828). The 8th-century Tantrasadbhava Tantra uses the term kundalī ("ring, bracelet; coil (of a rope)").