Fairies are generally described as human in appearance and having magical powers. Their origins are less clear in the folklore, being variously dead, or some form of demon, or a species completely independent of humans or angels. Folklorists have suggested that their actual origin lies in a conquered race living in hiding, or in religious beliefs that lost currency with the advent of Christianity. These explanations are not necessarily incompatible, and they may be traceable to multiple sources.
Summer Court:
These are creatures that control the Summer, They are at there strongest when there is both a king and a queen. These faerie control all the aspects of summer; the sun,fire,nature,etc. However they are very weak against the Winter Fearie.
Winter Court:
These are creatures that control the Winter, They are at there strongest when there is just a queen. These faerie control all the aspects of winter; the moon,water/ice,cold,etc. However they are very weak against the Summer Fearie.
Dark Court:
These are creatures that control the Dark, They are at they're strongest when there is just a king. These faerie control all the aspects of darkness; darkness,shadows,fear,etc. However they are very weak against the Light Fearie.
Light Court:
These are creatures that control the Light, They are at their strongest when there is a king and queen. These faerie control all the aspects of the light; Light,happiness,love,etc. However they are very weak against the Dark Fearie.
Seelie court:
These Faerie are the "rulers" of all faerie, they control all the aspects of the world, they can bend the threads of life and can change nature itself. However if they were to be attacked by anyone but a Faerie they would fall quickly.