Here is the long version.
According to lore, Night Elves are trolls that spent a long time exposed to the magic of the Well of Eternity.
High Elves are elves that were exiled, created the sunwell from waters of the Well of Eternity and changed from exposure.
Blood Elves are High Elves with a different name.
Void Elves are High Elves who were exposed to a lot of void and/or learned how to control void magic without going insane.
Nightborne are Night Elves who spent 10,000 years living off nothing but magic changed from the exposure.
Fal’dorei or Spider Elves were the result of Nightborne being exposed to the magic of the 1st Arcandor.
Naga are Night Elves transformed by N’zoth’s magic.
Satyrs are Night Elves transformed by the Burning Legion’s magic iirc.
So, Elves in WoW are just evolved trolls.
Or if we’re going to get all scientific
Night elves, High Elves/Blood Elves, Void Elves, Spider Elves, Nightborne, Naga, and Satyrs are their own species.
They all fall under the Night Elven Genus which falls under the Elven Family.
The Elven Family then falls under the Dark Troll Order which falls under the Troll Class.
Isn’t science great?