What is Śakti?
Śakti is the Sanskrit word for power or energy. In Hindu metaphysics it is the active, dynamic aspect of the absolute, the energy through which the unchanging ground gives rise to the changing world. It is personified as the Goddess, worshipped in her own right by the Śākta tradition, and it is also the energy a practitioner works with directly in *kuṇḍalinī* and *tantra* practice.
Śakti vs adjacent concepts
Śakti is not the same as *prāṇa*. Prāṇa names the vital-energy register specifically, the energy of breath and embodied life, while śakti is the broader category of which prāṇa is one form. It is also not essentially feminine in the gender-political sense the English translation can invite. The iconography and grammar personify śakti as the Goddess, but the claim the polarity encodes is about the energetic and stative aspects of a single reality, not a cosmic gender binary. The Western neo-tantric reading that treats śakti as a sexual energy to be roused for relational or therapeutic ends is a third-hand misreading of a curriculum the Indian tradition treats mainly as a metaphysical and yogic category; the *tantra* entry catalogues that misreading in more detail. And śakti is not separable from *Śiva*. The Ardhanārīśvara image, the Śava dictum, and the whole Kashmir Śaiva Trika are precise on the point: there is one non-dual reality, and its energetic self-display is its own ground recognising itself.
What the term names
Śakti, from the Sanskrit root śak, to be able or to have power, is one of the most elaborated concepts in the Indian record, used in roughly three registers the tradition does not sharply separate. In the metaphysical register śakti is the active, generative aspect of the absolute, the energy through which the unchanging ground gives rise to the changing world. In the theological register it is personified as the Goddess, Devī, Mahādevī, or in named forms as Pārvatī, Durgā, Kālī, Lalitā Tripurasundarī and many others, and worshipped as supreme reality by the Śākta wing of Hinduism. In the yogic register it is the energy the practitioner works with directly: [prāṇa](lexicon:prana)-śakti in the breath practices of *prāṇāyāma*, [kuṇḍalinī](lexicon:kundalini)-śakti in the dormant-then-roused energy the Haṭha Yoga Pradīpikā and the tantra literature catalogue, and icchā-śakti / jñāna-śakti / kriyā-śakti (will, knowledge, action) in the threefold subdivision the Kashmir Śaiva literature settled. The three registers are continuous, not separate: the energy the yogic body-diagrams chart is the same śakti the metaphysics calls the absolute's active aspect and the theology personifies as the Goddess.
The Śakti–Śiva polarity
The conventional Hindu reading places Śakti in polar relation to Śiva: Śiva the unconditioned, stative ground, Śakti the active energy through which the ground appears to itself as the manifest world. The polarity is not a relation between two separate principles. The standard formula, Śiva without Śakti is Śava (corpse), carries the claim: the stative ground apart from its own self-displaying energy is not the absolute but an abstraction. The absolute is the Śiva–Śakti unity, and the apparent two-ness of the polarity is itself one of Śakti's self-displays. The most-cited iconographic form of the position is the Ardhanārīśvara, the half-male, half-female image of Śiva and Śakti in one body, divided down the midline, the two sides equally weighted. The Śāktas read the polarity asymmetrically, with Śakti the operative reality and Śiva her ground; the Śaivas read it the other way; the Kashmir Śaiva school holds both readings at once as descriptions of one non-dual reality from different angles.
Śakti in the lived tradition
The contemporary Indian teacher who has most visibly carried śakti into English-language exposition is Sadhguru. His Īśā Yoga curriculum treats the Śiva-Śakti polarity as its working metaphysical frame, and the Ādiyogi iconography at the Īśā Yoga Center in Coimbatore is exactly the Śiva-as-first-yogī and Śakti-as-the-energy-the-yogī-works-with pair. Both *Inner Engineering: A Yogi's Guide to Joy* and Inner Engineering Online work śakti into their practice frame, especially in the chapters on the energetic body and on kuṇḍalinī; Sadhguru on disability and spiritual practice and Sadhguru on unlocking the mind's full potential take the same vocabulary into more applied registers. The earlier twentieth-century English-language transmission of the same material is Paramahansa Yogananda's *Autobiography of a Yogi*, which treats Kuṇḍalinī Śakti, the Divine Mother and the Mahā-Śakti across several chapters and was the first Indian devotional account of the śakti register to reach a mass American readership. The Bengali devotional tradition that produced Ramakrishna, the nineteenth-century mystic whose worship was directed at Kālī, the fierce form of Śakti, is the Śākta setting for the Indian bhakti register the Yogananda and Maharaji lineages later domesticated for the West. The spanda (vibration, pulsation) terminology the Kashmir Śaiva school settled, Śakti as the spontaneous self-vibration of consciousness, is the most technically precise account of the same dynamism the wider Indian world calls śakti.
