Classes of Tantra in Tibetan Buddhism refers to the categorization of Buddhist tantric scriptures in Indo-Tibetan Buddhism.

To practice and train thoroughly in a vast range of deeds related to activations, which are sets of outer (physical and verbal) [actions] such as mudras and other characteristic focuses as taught in action tantra, and thus [to have] objects of practice that accord with that tantra; to cultivate inner (mental) contemplation that accords with... See more