Clairvoyance is the ability to perceive information through visual subjective perceptions. Clairvoyance takes place in a flash, through the appearance of very brief mental images which interpretation is obvious rather symbolic.
Clairvoyance is different from divinatory sciences. The latter consist in an intellectual interpretation of signs obtained through various media (cards, star charts, etc.).
Sometimes, clairvoyance became an institution. It was the case with many civilizations of the ancient world, for example in Delphi, where the people used to consult the Oracle and its priestesses, the Pythia, who obtained visions by focusing on a fire.
In today’s modern world voyance helps people make better choices based on indications that the voyant interprets, and in turn helps individuals to set expectations and make constructive plans.