Is Hollow Knight: Silksong a DLC or new game?

Is Hollow Knight: Silksong a DLC or new game? Initially planned as yet another piece of DLC, Hollow Knight: Silksong, originally called Hornet, became so large that Team Cherry decided to make it a full sequel.

Initially planned as yet another piece of DLC, Hollow Knight: Silksong, originally called Hornet, became so large that Team Cherry decided to make it a full sequel.
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