In Vajrayana, guru yoga (Tib: bla ma’i rnal ‘byor) is a tantric devotional practice in which the practitioner unites their mindstream with the mindstream of the body, speech, and mind of their guru
Guru yoga is akin to deity yoga since the guru (who can be a Buddha, a historical figure like Padmasambhava, or a living person) is visualized in the same manner as with a meditational deity
The process of guru yoga may entail visualization of a refuge tree as an invocation of the lineage, with the ‘root guru’ channeling the blessings of the entire lineage to the practitioner
The guru may be visualized as above the meditator, in front of them, or in their heart
Guru yoga may also include a liturgy, prayer, or mantra, such as the “Seven Line Prayer” of Padmasambhava, or the “Migtsema” (a prayer to Je Tsongkhapa)