How does C0 and C1 work?

Can someone give me a detailed explanation about C0 and C1 properties of welds? Because I can’t really understand them.

You are welding 2 cframes together e.g. C0 and C1

Wait but what do you mean by welding two CFrames together?

motor6d:
c0 is the CFrame of part0
c1 is the The relative CFrame by c0

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I mean they’re being welded lol?