user41513: 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?

user85924: PBFT is Practical Byzantine Fault Tolerance. It is a "classical" consensus algorithm that uses a state machine. Uses leader and block election to select a leader.
PBFT is a three-phase, network-intensive algorithm (n^2 messages), so is not scalable to large networks

41513: <p>Can we consider <strong>PBFT (Practical Byzantine Fault Tolerance)</strong> as a consensus algorithm ?</p>

<p>And if yes, <strong>How</strong> does it work?</p>

<p>And is it <strong>similar</strong> to other consensuses such as <strong>PoW</strong>, <strong>PoS</strong> or <strong>PoA</strong> ? Or it is <strong>totally different</strong>?</p>

<p>And is it <strong>used</strong> actually in a blockchain platform? if yes, <strong>which one</strong>?</p>

<p>P.S. I heard that it is NOT <strong>scalable</strong> for large network, <strong>Is it true</strong>? And if so, is its scalability <strong>even worse</strong> than PoW?</p>
 85924: <p>PBFT is <code>Practical Byzantine Fault Tolerance</code>. It is a "classical" consensus algorithm that uses a state machine. Uses leader and block election to select a leader.</p>

<p>PBFT is a three-phase, network-intensive algorithm (n^2 messages), so is not scalable to large networks</p>
