The 'Yogatantra' (Sanskrit) 'conveyance' (Sanskrit: yana) is the most sublime of the three Outer Tantras. It includes a class of Buddhist tantric literature as well as 'praxis' (Sanskrit: sadhana) associated with this class. The Yogatantra yana is evident in both the Sarma traditions of Tibetan Buddhism as well as the Nine Yana path of the Nyingmapa tradition.
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Jamgon Kongtrul (1813-1899) defines Yoga tantra by making reference to the Two Truths doctrine and 'method' (Sanskrit: upaya) and 'wisdom' (Sanskrit: prajna) and is rendered into English from the Tibetan by Guarisco and McLeod, et al. (2005: p.128) thus:
"Yoga tantra is so named because it emphasizes the inner yoga meditation of method and wisdom; or alternatively, because based on knowledge and understanding of all aspects of the profound ultimate truth and the vast relative truth, it emphasizes contemplation that inseparably unites these two truths."
Meditation on buddhas yogatantra
Nomenclature, orthography and etymology
Praxis
Yoga tantra involves 'deity yoga' (Tibetan: ལྷའི་རྣལ་འབྱོར, Wylie: lha'i rnal 'byor; Sanskrit: Devata-yoga).