Eladrin

Elves who live in the Outer Planes Umbra Positive Material Plane Feywild.

Used to be a sort of elven celestial until 4e came out. They were Chaotic Good celestials with a big fairy motif. This interpretation survived into Pathfinder under the rename of Azatas, varying from "elves with super magical powers" like Bralani and Ghaele to more exotic forms like Lillends (lamias with angel wings), Brijidines (flying elves made of lava) and Lyrakiens (standard butterfly-winged fairies).

In 4e, they absorbed all of the old "elf as a super-magical being with mastery over arcane arts" lore and stuff, since it was always kind of weird that elves got portrayed as being both wizard masters and druidic-styled nature-hugging hippy freaks, since wizards and druids often don't get on. Not that the split was entirely unprecedented, 4e was just the first edition to fully split the two instead of making each race simply "lean more towards" one side of the equation. They had Intelligence bonus, the more "magical" elf abilities like trancing and charm resistance, and an encounter teleport power named Fey Step.

Closest AD&D equivalent would be grey elves, only this time the "grey" means "grey aliens like from UFOs" instead of just "very old."

They're no good at anything physical, so if you want a mage/druid/etc. they're pretty sweet. On the other hand, they're a kind of Elf, and so are tainted with faggotry.

Appeared in the 5e DMG as a fourth elven subrace. Pretty effectively translated, actually; +1 Int, Elven Weapon Proficiency, even got Fey Step (Misty Step spell-like ability usable once per short rest) back.