What is the difference between Consensus and Distributed Consensus?
A consensus is an agreement between several agents. So it's always distributed in that sense.
But here it is about the process of how to achieve such consensus.
It's not dictated by one master. But agreed on by distributed voting.
Due to temporal logic being a nasty beast, you can't assume everyone to be on the same page at a specific point of time. But eventually everyone will reach a certain state of consensus.