About Esoteric transmission

In Vajrayāna Buddhism, esoteric transmission is the transmission of certain teachings directly from teacher to student during an empowerment (abhiṣeka) in a ritual space containing the mandala of the deity. Many techniques are also commonly said to be secret, but some Vajrayana teachers have responded that secrecy itself is not important and only a side-effect of the reality that the techniques have no validity outside the teacher-student lineage.