~What Is A Faerie~
"Faerie" is the generic term for all creatures, mistakenly called 'supernatural', who are neither in God's nor the devil's service. Faries inhabit most countries of the world, but each nation has its particular cultural group. Irish Leprechauns, Scottish Brownies and German Kobolds are all faeries, all independent of religion and quite natural in movement, taste and manners.
In Ireland two distinct faerie types exist - the trooping faeries and the solitary faeries. The trooping faeries are to be found in merry bands about the hawthorn tree or at feasts in gilded faerie places. They delight in company, while the solitary faeries avoid large gatherings, preferring to be left by themselves and separate from one another. The trooping faeries are the major and presiding residents of faerieland; but the solitary ones have greater interest in mortal affairs and hence are gernerally more familiar to us.
Irish faerieland exists now. It has always existed alongside mortal borders. And there has always been considerable intercourse between the two realms, although the traffic has diminished in modern times. But although few mortals have the ability any more to see those of faerieland, faeries still live in immortal good health and will yet manifest themselves to those sincere of believe and simple and passionate in nature.
Source: Carolyn White "A History of Irish Fairies"