Psychics are people who are able to sense the energy of people, places, and objects. The term includes those who are able to practice psychometry, the reading of objects, and Biointroscopy, the reading of places. There are others who display innate abilities like ESP [mind reading] or telekinesis [the ability to move objects with the mind]. Clairvoyants can see future or past events. Sometimes they can perceive events as they happen at a distance.
Not all psychics are mediums and vice versa; however many are both. There are some very well-known cases and people who fit into these categories such as psychic Gerald Croiset or medium James Van Prague.
PROS in the past has worked with and studied the phenomenon of both psychics and mediums. The information they provide should be considered subjective unless there is physical supporting evidence given by the psychic/ medium which is proven not to be known to them.