Can we consider PBFT (Practical Byzantine Fault Tolerance) as a consensus algorithm ?
And if yes, How does it work?
And is it similar to other consensuses such as PoW, PoS or PoA ? Or it is totally different?
And is it used actually in a blockchain platform? if yes, which one?
P.S. I heard that it is NOT scalable for large network, Is it true? And if so, is its scalability even worse than PoW?