What is Byzantine Fault Tolerance Delegated Proof of Stake (BFT-DPoS)?

Byzantine Fault Tolerance Delegated Proof of Stake (BFT-DPoS) is the primary consensus mechanism that runs the EOSIO and ICON blockchain ecosystems. BFT-DPoS is a highly-performant consensus mechanism that makes use of data passing between parties without an intermediary. It is composed of the two main layers that work together: Asynchronous Byzantine Fault Tolerance (aBFT) to propagate and validate block production, and Delegated Proof of Stake (DPoS) for block producer voting and scheduling.