A Medium is someone that was ressurected as a human and given the ability to see Ghosts on The Other Side.
Throughout the SeriesEdit
The first Medium in The Vampire Diaries was Jeremy Gilbert. Bonnie Bennett returned him to life, an act that gave him the ability to see Ghosts.
Bonnie also ressurected Matt Donovan from drowning, making him a Medium.
The last Medium seen in the series so far is Faith Holloway. Faith was returned from the dead by her coven when she died soon after birth. Because she was a Witch as well, she began to channel the powers of The Other Side and was able to summon Ghosts into her body for a limited amount of time.