A Vulcan telepathic technique in which touch at the face lets two minds share thoughts, memories and sensations, used for communication, healing, interrogation and the passing on of knowledge.
The mind meld is a Vulcan technique that links two minds through physical contact, usually fingertips placed on the face. The participants share thoughts, memories and feelings, which makes the experience intensely intimate and sometimes dangerous for both.
Spock performs the first one seen, on Simon Van Gelder in Dagger of the Mind, and later melds with the Horta in The Devil in the Dark and, by force, with Valeris in Star Trek VI: The Undiscovered Country. Sarek's meld with Jean-Luc Picard in Sarek lets the ambassador finish his last mission, and Tuvok's meld with Lon Suder drives the Voyager episode Meld.
Enterprise shows that in the 22nd century melding was a stigmatised practice of a minority, as in Fusion and Stigma, until the reforms that follow the recovery of the Kir'Shara.