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Warning! This page contains spoilers for The Sword of Summer.
Alfheim (pronounced "ALF-hame") is one of the Nine Worlds, more specifically the one inhabited by the light elves. According to Hearthstone, it isn't that different from Midgard, only brighter, and with no nights.
The inhabitants of this realm are known as Elves and used to practice magic known as alf-seidr (which the children of Frey and Frey himself can perform) however now they have no knowledge of the other realms and sit in front of pixel screens all day long.
The bright light around Alfheim is said to be different from that from Folkvanger.
Alfheim is described to be like an upscale neighborhood.
Magnus and Hearth journey to Alfheim to find the Snoknung Stone in order to save Blitz.