Plane of Faerie
The Plane of Faerie is a lesser plane that has shown up in various editions of Dungeons & Dragons. As its name suggests, it is the basic extraplanar home of the fey.
In Advanced Dungeons & Dragons, the Plane of Faerie is a demiplane centered around the Archfey, which migrates between the various planes in the Chaotic Good corner of the Great Wheel.
In Dungeons & Dragons 3rd Edition, the Plane of Faerie was introduced as an independent/anomalous plane in the 3e Manual of the Planes.
In Pathfinder, the Plane of Faerie was made its own fully-fledged plane and part of the Great Beyond, existing as a kind of primal, magic-rich prototype of the Material Plane known as the First World. It is argued whether it came before or after the 4e version.
In Dungeons & Dragons 4th Edition, the Plane of Faerie was finally integrated into the core cosmology from the very beginning, becoming an important part of the new World Axis cosmology called the Feywild. See that plane for details. Dungeons & Dragons 5th Edition would retain the Feywild in its weird redesign of the Great Wheel.