Tendermint is a software that helps create and maintain blockchain networks. It combines a consensus algorithm with a networking layer, allowing different nodes in the network to agree on the state of the blockchain efficiently. This makes it easier for developers to build decentralized applications without worrying about the underlying complexities of the blockchain. The Tendermint Core is the core component of this system, ensuring that transactions are processed quickly and securely. It uses a proof-of-stake mechanism, which means that validators are chosen based on the amount of cryptocurrency they hold and are willing to "stake" as collateral. This approach enhances security and reduces energy consumption compared to traditional proof-of-work systems.