Clairvoyance, produced from a 17th Century term which means clear vision, is a form of ESP - Extra Sensory Perception. Although often used to describe many different psychic abilities, such as second sight, telepathy, prophetic ideas and psychic desires, it is strictly speaking an ability to discern information about a person, object, location or event via perception other than from the usual five feelings. A person gifted with this ability is called a clairvoyant - a person who sees clearly.
In parapsychology, the term clairvoyance is used purely to describe information - both in the present time and not readily accessible to the particular clairvoyant - coming from an external source, rather than telepathy, where information is transmitted from one mind to a different. In other words, a clairvoyant has the ability to see or perhaps visualise events, items or persons outside the capability or array of physical sight.
Distant viewing, usually a controlled, specific process, can be a facet of voyance par telephone, as is email dreaming. For instance, you might dream about a location they've never seen before and later on find it is exactly as they had visualised it within their dream.
This became of me, for example, when I was about to start my first term at college. As I had never been to the city where the school was located, my dad offered to take me there in order to find just how from the train station towards the college. Having dreamed about it the night before we went, I used to be able to lead him to the college along the shortest course possible, knowing wherever and when to turn. I was even able to tell him how long it would get us to get there.
However, outside of the area of parapsychology the term is generally used to describe other types of paranormal, or anomalous, perception. Most of the time, it is used in relation to its the perception of earlier (retro cognition) or future (precognition) events. This is a gift many have without even realising it. To use another personal expertise as an example (and I don't claim to be a clairvoyant in any way), a few years ago, a friend's daughter had gone into hospital early in the evening to have the girl first child. Although with a group of shared friends around 10 PM, someone suggested we should call the hospital and find out just how she was making. As one of them picked up the phone, I declared that a call could be wasted, as she would have a little boy in early hours of the following morning. We known as anyway and were told she was sleeping as the labour had slowed. My friend explained to me the next morning in which her grandson was born at 5:30 AM.
Frequently, platforms will also refer to the particular perception of images perceived during communication along with spirits as clairvoyance.
Whatever the case, clairvoyance is a precious reward which can and should supply in order to help and guide others.