Cosmos is a decentralized network of blockchains that allows for the creation and management of digital assets and the execution of smart contracts. It aims to connect different blockchain networks, allowing them to work together, transfer assets, and share resources and services.
The Cosmos Hub is the main blockchain of the Cosmos network, which serves as a hub for other blockchains to connect to, it uses a consensus mechanism called Tendermint BFT, which is known for its speed and security. It also has a built-in protocol called IBC, that enables the communication between different blockchains in the ecosystem.