Clairvoyance literally means 'clear seeing'. A true Clairvoyant will see, hear or sense alternate dimensions to life, such as the thoughts and feelings of others, the past, the future, potential outcomes of choices made etc. Every Clairvoyant has their own specific field of expertise and knowledge.
A natural Clairvoyant is someone who was born with a strong Clairvoyant ability and who from a very young age is aware of alternate perceptions. These perceptions are not always understood or encouraged by adults and can lie dormant in a person until life offers a window of opportunity to nurture these talents into full use.
Natural Clairvoyants have an absolute inner 'knowing' of how to use their gifts - it just happens - it develops and grows along side everyday normality (whether the person likes it or not!). Yes, it can be suppressed, but this will be done at great cost to that person's truth and persona. It is not an easy path to walk, but it is a fantastic and fascinating one, once the talent is fully accepted and lived in the way it was meant to be.
It is possible to develop a Clairvoyant ability over time, with mental exercises. There are many books around today teaching this. There is nothing wrong with discovering and developing your own Clairvoyant gift. As long as nothing is forced and the gift is used for good and true intent, it can be a life enhancing thing both for yourself and others.