Tibetan tantric practice in the context of Ngöndro

Vajrayāna (Sanskrit: वज्रयान, lit. 'Diamond Vehicle or Thunderbolt Vehicle'), otherwise known as Mantrayāna ("Mantra Vehicle"), Guhyamantrayāna ("Secret Mantra Vehicle"), Tantrayāna ("Tantra Vehicle"), Indo-Tibetan Buddhism, Tantric Buddhism, and Esoteric Buddhism, is a Mahāyāna Buddhist tradition that emphasizes esoteric practices and rituals aimed at rapid spiritual awakening. Emerging between the 5th and 7th centuries CE in medieval India, Vajrayāna Buddhism incorporates a range of techniques, including the use of mantras (sacred sounds), dhāraṇīs (mnemonic codes), mudrās (symbolic hand gestures), mandalās (spiritual diagrams), and the visualization of deities and Buddhas. These practices are designed to transform ordinary experiences into spiritual paths toward enlightenment and liberation, often by engaging with aspects of desire and aversion in a ritualized context.

A distinctive feature of Vajrayāna Buddhism is its emphasis on esoteric transmission, where teachings are passed directly from teacher (guru or vajrācārya) to student through initiation ceremonies. Tradition asserts that these teachings have been passed down through an unbroken lineage going back to the historical Buddha (c. the 5th century BCE), sometimes via other Buddhas or bodhisattvas (e.g., Vajrapani). This lineage-based transmission ensures the preservation of the purity and effectiveness of the teachings. Practitioners often engage in deity yoga, a meditative practice where one visualizes oneself as a deity embodying enlightened qualities to transform one's perception of reality. The tradition also acknowledges the role of feminine energy, venerating female Buddhas and ḍākiṇīs (spiritual beings), and sometimes incorporates practices that challenge conventional norms to transcend dualistic thinking.

In Vajrayāna Buddhism, an empowerment or consecration (Sanskrit: abhiṣeka, lit. ablution; sprinkling) is an esoteric initiation or transmission of secret teachings performed by a tantric guru (vajracharya) to a student in a ritual space containing the mandala of a Buddhist deity. The initiation is traditionally seen as transmitting a certain spiritual power (Sanskrit: adhiṣṭhāna, Tibetan: jinlap, sometimes translated as "blessings") which allows the tantric yogi to reach enlightenment swiftly or to attain other yogic accomplishments.

Many tantric practices are commonly said to be secret, and are only to be revealed after ritual initiation. Other tantric practices may be openly known, but are only considered to be effective after being initiated into the proper mandala which corresponds to a specific practice. The secrecy of teachings was often protected through the use of allusive, indirect, symbolic and metaphorical language (twilight language) which required interpretation and guidance from a teacher. The teachings may also be considered "self-secret", meaning that even if they were to be told directly to a person, that person would not necessarily understand the teachings without proper context or initiation. In this way, the teachings are "secret" to the minds of those who are not following the path with more than a simple sense of curiosity.

The fundamental practice of Vajrayana and Tibetan tantra is deity yoga (devatayoga), a form of Buddhist meditation centered on a chosen deity or "cherished divinity" (Skt. Iṣṭa-devatā, Tib. yidam). This involves the recitation of mantras and prayers alongside the detailed visualization of the deity and their mandala—a sacred configuration that includes their Buddha field, consorts, and attendant figures. The 14th-century scholar Tsongkhapa stated that deity yoga is the distinctive feature that sets Tantra apart from the Sutra-based path.

In the highest class of Tantras, the Unsurpassed Yoga Tantras, deity yoga is typically practiced in two stages: the generation stage (utpatti-krama) and the completion stage (nispanna-krama). In the generation stage, practitioners dissolve ordinary perception into emptiness and then re-imagine reality through the form of a fully enlightened deity, understood as an expression of ultimate truth. The deity is visualized as “empty yet apparent,” like a mirage or rainbow, never solid or objectively real.

A kapala (Sanskrit for "skull") is a skull cup used as a ritual implement (bowl) in both Buddhism Tantra and Tibetan Buddhist Tantra (Vajrayana). Especially in Tibetan Buddhism, kapalas are often carved or elaborately mounted with precious metals and jewels.In Hinduism, tantric and aghoris use Kapala for rituals