Tendermint Core is a Byzantine Fault Tolerant (BFT) software platform that provides databases and supporting libraries for blockchain applications that can be written in any programming language and securely replicated on many machines.
Inter-Blockchain Communication Protocol
Zones are connected to the Cosmos Hub via the Inter-Blockchain Communication protocol (IBC), a mechanism that enables information to travel freely and securely between each connected zone.
The Cosmos SDK is an advanced framework powered by the Tendermint BFT algorithm. Its main task is to reduce the complexity of ABCI as well as allow developers to customize their decentralized applications.
The Cosmos Hub was the first blockchain to be launched on the Cosmos network. It is tasked with facilitating interoperability between all the zones within the network by keeping track of their states.