Answer: The Klaytn Testnet is a development environment for blockchain developers to test their applications and smart contracts. It provides a safe and secure environment for developers to experiment with their code and ensure that their applications are functioning correctly. The link provided above is the official Klaytn Testnet Faucet, which allows developers to obtain Klaytn Testnet tokens to use in their development environment. Using this faucet, developers can receive free Klaytn Testnet tokens to test their applications and smart contracts.