Vajrayoginī (वज्रयोगिनी / Tibetan: རྡོ་རྗེ་རྣལ་འབྱོར་མ་ / Chinese: 瑜伽空行母) is a Tantric Buddhist (तांत्रिक बौद्ध / वज्रयोगिनी, Vajrayāna) female Buddha (बुद्ध) and a ḍākiṇī (डाकिनी).
- Vajrayāna (वज्रयोगिनी / རྡོ་རྗེ་རྣལ་འབྱོར་མ་ / 瑜伽空行母 / मंत्र्याना, Mantrayāna / तंत्रनारायण, Tantrayān / तांत्रिक बौद्ध धर्म, Tantric Buddhism / गूढ़ बौद्ध धर्म, Esoteric Buddhism) is a term referring to the various Buddhist traditions (schools ) of Tantra (तंत्र) and "Secret Mantra" ("गुप्त मंत्र"), which developed in Medieval India and spread to Tibet, Bhutan, and East Asia.
In Tibet, Buddhist Tantra (बौद्ध तंत्र) is termed Vajrayāna (वज्रयोगिनी / རྡོ་རྗེ་རྣལ་འབྱོར་མ་ / 瑜伽空行母), while in China it is generally known as Tángmì Hanmi (漢密 / 唐密, "Chinese Esotericism") or Mìzōng (密宗, "Esoteric Sect") and in Japan it is known as Mikkyō (密教, "Secret Teachings").
Vajrayāna (वज्रयोगिनी / རྡོ་རྗེ་རྣལ་འབྱོར་མ་ / 瑜伽空行母) is usually translated as Diamond Vehicle or Thunderbolt Vehicle, referring to the Vajra (वज्र), a mythical weapon which is also used as a ritual implement.
- A dâkini (डाकिनी) is a manifestation of liberating energy in female form.
- In Buddhist Tantra (बौद्ध तंत्र), iconic dâkinis (डाकिनी) help arouse blissful energy in a practitioner, transforming defiled mental states, or klesas (क्लेश,Kleśa / "poison"), into enlightened awareness.
- The archetypal dâkini (डाकिनी) in Tibetan Buddhism (तिब्बती बौद्ध धर्म), is Yeshe Tsogyal (येशे सोवाईगल / Tibetan: ཡེ་ཤེས་མཚོ་རྒྱལ / Chinese: 益西措傑 / "Victorious Ocean of Wisdom", "Wisdom Lake Queen"), consort of Padmasambhava (पद्मासाम्भव / गुरु रिंपोछे, Guru Rinpoche / "Lotus-Born").

Vajrayoginī (वज्रयोगिनी / Tibetan: རྡོ་རྗེ་རྣལ་འབྱོར་མ་ / Chinese: 瑜伽空行母) is an Anuttarayoga Tantra Iṣṭadevatā (अन्तारा योग तंत्र इजादेवाटा / परम योगशब्द तन्त्र यिदम्, Meditation Deity), and her practice includes methods for preventing ordinary death, intermediate state (बार्डो, bardo) and rebirth (by transforming them into paths to enlightenment), and for transforming all mundane daily experiences into higher spiritual paths.
Practices are associated with her Chöd (चोड) and the Six Yogas (छह योग) of Naropa (नरोपा).
She is often described with the epithet "sarvabuddhaḍākiṇī" (सर्वबुद्धडाकिनी), meaning "the dâkini (डाकिनी) who is the Essence of all Buddhas (बुद्ध)".
- In some schools of Buddhism (बौद्ध धर्म), bardo (बार्डो / Tibetan: བར་དོ་) or antarabhāva (अंटारभवा) is an intermediate, transitional, or liminal state between death and rebirth.
It is a concept which arose soon after the Buddha's passing (बुद्ध), with a number of earlier Buddhist groups accepting the existence of such an intermediate state, while other schools rejected it.
In Tibetan Buddhism (तिब्बती बौद्ध धर्म), bardo (बार्डो / Tibetan: བར་དོ་) is the central theme of the Bardo Thodol (བར་དོ་ཐོས་གྲོལ, बार्डो थोडोल / "Liberation Through Hearing During the Intermediate State"), the Tibetan Book of the Dead.
- Chöd (चोड / Tibetan: གཅོད / "to sever"), is a spiritual practice found primarily in the Nyingma (निंग्मा) and Kagyu (काग्यू) schools of Tibetan Buddhism (तिब्बती बौद्ध धर्म), where it is classed as Anuttara Yoga Tantra (अन्तारा योग तंत्र).
Also known as "Cutting through the Ego", the practices are based on the Prajñāpāramitā (་ཤེས་རབ་ཀྱི་ཕ་རོལ་ཏུ་ཕྱིན་པ་, प्रजनापरमिता / "Perfection of Wisdom") sutras (सूत्र, aphorisms) which expound the "emptiness" concept of Buddhist Philosophy.
According to Mahayana Buddhists (ཐེག་པ་ཆེན་པོ།, महायान), emptiness is the ultimate wisdom of understanding that all things lack inherent existence.

- Nāropā (नरोपा / Nāropadā, Naḍapāda, Abhayakirti) or Abhayakirti (अभ्यकर्ती) was an Indian Buddhist Mahasiddha (महासिध / "someone who embodies and cultivates the 'Siddhi of Perfection' or the spiritual, paranormal, supernatural, magical powers").
He was the disciple of Tilopa (टिलोपा / Tantric practitioner and Mahasiddha / 988 - 1069) and brother, or some sources say partner and pupil, of Niguma (निगुमा / one of the most important and influential Yoginis and Vajrayana teachers of the 10th or 11th century in India).
As an Indian Mahasiddha (महासिध), Naropa's instructions (नरोपा) inform Vajrayana (वज्रयोगिनी / རྡོ་རྗེ་རྣལ་འབྱོར་མ་ / 瑜伽空行母), particularly his Six Yogas (छह योग) of Naropa (नरोपा) relevant to the completion stage of Anuttara Yoga Tantra (अन्तारा योग तंत्र).

Vajrayoginī (वज्रयोगिनी / Tibetan: རྡོ་རྗེ་རྣལ་འབྱོར་མ་ / Chinese: 瑜伽空行母) is "inarguably the supreme Deity of the Tantric Pantheon.
No male Buddha (बुद्ध), including her Divine consort, Heruka-Cakrasaṃvara (चक्रसंवर), approaches her in metaphysical or practical import.