Espresso is a decentralized shared sequencing network designed to coordinate transaction ordering across multiple Ethereum rollups, including ecosystems like Arbitrum. Instead of each rollup relying on its own centralized sequencer, Espresso introduces a neutral, decentralized layer that can provide fast confirmations and improve cross-chain composability. By standardizing how transactions are ordered and finalized, it reduces fragmentation and enables smoother interoperability between Layer 2 networks.