Wikipedia is saying:
A fairy (also faery, faerie, fay, fae; euphemistically wee folk, good folk, people of peace, fair folk, etc.) is a type of mythical being orlegendary creature, a form of spirit, often described as metaphysical, supernatural or preternatural. Fairies resemble various beings of other mythologies, though even folklore that uses the term fairy offers many definitions. Sometimes the term describes any magical creature, includinggoblins or gnomes: at other times, the term only describes a specific type of more ethereal creature.
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.
There is something magical and whimsical about fairies and I love to capture it in my paintings: