Görli is an Ethereum testnet (or test network). Testnets are typically used by developers to run "tests" for their application or software. Currency on testnet are valueless. Görli is open-source and is the first proof-of-authority cross-client testnet, synching Parity Ethereum, Geth, Nethermind, Pantheon, and EthereumJS. 

Visit the official website here: https://goerli.net

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