Siddhi (Sanskrit for “accomplishment”, “success”) — transcendental capacity, hidden abilities of a man. For example, telepathy, teleportation, the gift of healing, clairvoyance, ability to go without food and water for a long time, etc. One will possess siddhis after practicing yoga hard and for a long time. Besides, there are special techniques that help develop some or other abilities. But most of the gurus believe that spiritual enlightenment is much more important that obtaining siddhis.