Clairvoyance is the ability to see things which are beyond the normal range of the known five senses. Meaning literally clear sight or clear vision this usually pertains to an idividulal's ability to see ghosts or events of the past or future. This gift has been used by many over centuries to try to give guidance, fortell future events and some have even tried to use it to win the pools or lottery.
Though many books have been written on the subject nobody really knows where this ability comes from. For those with religious leanings it is either a gift from god or the work of the devil. Science looks first for proof that it works, then for proof of how it works. As one blessed? With this gift , I like many others am caught between the devil and the deep blue sea, to coin a phrase. Those of us with this kind of ability, and there are many thousands around the world, want to use it as seems it should be used, to help others and to learn.
That is surely what we are all here for.