Tendermint - is a blockchain protocol with an open-source code used for building blockchain applications with any programming language securely and consistently. The protocol provides the networking and consensus layers of blockchains as a platform to develop different dApps.
TVL, or Total Value Locked, refers to the total amount of crypto assets currently locked or deposited into a DeFi protocol or platform. It represents the total value of assets that users have committed to these platforms for purposes such as lending, borrowing, liquidity provision, or staking.
A testnet is a separate blockchain network created for the purpose of testing and experimenting with new features, applications, or upgrades without risking real crypto assets. It allows developers and users to simulate transactions and interactions in a safe and controlled environment to ensure the reliability and security of the technology before deploying it on the mainnet.