Fairies are generally described as human in appearance and having magical powers.

Their origins are less clear in the folklore, being variously the dead, or some form of angel, 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 always mutually incompatible, and they may be traceable to multiple sources.
Much of the folklore about fairies revolves about protection from their malice, by such means as cold iron (fairies don't like iron and will not go near it) or charms of rowan and herbs, or avoiding offense by shunning locations known to be theirs. In particular, folklore describes how to prevent the fairies from stealing babies and substituting changelings, and abducting older people as well. Many folktales are told of fairies, and they appear as characters in stories from medieval tales of chivalry, to Victorian fairy tales, and up to the present day in modern literature.