Tendermint consensus: Are validators "known" and "pre-selected"?

Tendermint consensus: Are validators "known" and "pre-selected"?

What are similarities and differences between Tendermint consensus and Proof-of-Stak?

For example, in both consensus, a validator is selected randomly (I think in Tendermint consensus they are selected in a round robin process).

And I think in Tendermint consensus, validators are known and pre-selected, unlike Proof-of-Stake consensus. Is it true? and if yes, what entity does confirm a known validator?

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