Here's etherium's well written white paper on it.

https://docs.zkproof.org/pages/standards/accepted-workshop3/proposal-semaphore.pdf

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I've seen that, just wanted to hear if you'd explain it like "just multisig"

No, zk merkle trees cannot be explained like lightning being just a multi-sig node network, can.

Why not? Lightning is obviously more than "just 2-party multisigs", as I'm sure zk merkle trees is too.