It is said that at one time, the human and Faery worlds were one, but legend tells that our human ancestors became trapped in the physical world. They became less and less aware of what was hidden just beyond their physical sight, and the vision and magical skills of the Faery became lost to them.
Fairies are so prevalent in mythical culture, it's natural to wonder where they came from. Different societies have come up with very different explanations of the origins of the "little people." A faery to one culture is goodness and light, whereas another culture may have faeries who are untrustworthy and evil.