What is Optimism? The Ethereum Layer2 Protocol

It is a Layer 2 protocol of Ethereum, considered a scaling solution since it uses "optimistic summaries" to process transactions in batches, which reduces gas fees. You could define it as an aid for Ethereum users to save on gas fees by accumulating batches of transactions.
https://www.vanticatrading.com/post/what-is-optimism-the-ethereum-layer2-protocol

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