What is clairvoyance?

Clairvoyance is the ability to experience sensation or thought that is derived from input other than ourselves or the physical realm in which we dwell. Generically, these sensations are called extra-sensory perceptions (ESP). Experiencing clairvoyant signals is usually related to some internal realization or via some sort of approximation or channelling through our physical senses. Names have been given to the types of these sensations.

• Clairsentience (feeling or touching) is the acquisition of psychic knowledge primarily by means of feeling or touching. It can relate to the feeling of the vibrations of lifeforms. Different degrees of clairsentience range from the perception of diseases of other people to the thoughts or emotions of other people.
• Psychometry or token-object reading (knowledge gained through touch) is the acquisition of psychic knowledge about an individual by making physical contact with an objects that has been in contact with that person.
• Clairaudience (hearing or listening) is the reception of psychic knowledge by paranormal auditory means, such as a voice or music with no physical source. The ESP auditory sensation may come from within one's mind, inner ear or perceived as being external.
• Clairalience (smelling) is the paranormal experience of a odor, scent or other smell with no physical source.
• Claircognizance (knowing) the intrinsic acquisition of psychic knowledge. This is the ability to paranormally know something without knowing how or why.
• Clairgustance (tasting) is the ability to paranormally taste or perceive the essence of a substance without it coming into contact with one's mouth.

Reference: Glossary of Psi (backup link)