Consensus in Polkadot means a group of members reaching an agreement on specific information, like how to arrange and form blocks in a blockchain. They use different methods (algorithms) to reach this agreement. In Polkadot, they use an algorithm called GRANDPA to agree on this information. It’s like a teamwork decision-making process for arranging and organizing information in a way everyone involved can trust.
Consensus
Consensus is the process of a group of entities to agree on a particular data value (such as the ordering and makeup of blocks on a blockchain). 