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A collab, in the context of Celeste, is a map pack created by multiple contributors (generally three or more). Collabs generally feature maps that are unrelated to each other, a lobby connecting maps together, and in some instances, fusion maps and custom music.
Collabs vary greatly in size. Some may involve half a dozen maps, but others can feature over a hundred. They can also vary in difficulty; whilst some are of a primarily beginner/vanilla-like difficulty, others can easily be so much harder.