Can you explain the key features of Optimism, Polygon (Matic), and Arbitrum?

Could you provide an overview of the key features of Optimism, Polygon (Matic), and Arbitrum? I'm interested in understanding how these Layer 2 scaling solutions enhance Ethereum's performance, their unique functionalities, and any notable differences between them that contribute to their popularity within the crypto and decentralized application ecosystem.

#Crypto FAQ

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