Arbitrum is an L2 scaling solution for Ethereum, offering a unique combination of benefits:
Trustless security: security rooted in Ethereum, with any one party able to ensure correct Layer 2 results
Compatibility with Ethereum: able to run unmodified EVM contracts and unmodified Ethereum transactions
Scalability: moving contracts’ computation and storage off of the main Ethereum chain, allowing much higher throughput
Minimum cost: designed and engineered to minimize the L1 gas footprint of the system, minimizing per-transaction cost.
Some other Layer 2 systems provide some of these features, but to our knowledge no other system offers the same combination of features at the same cost.
Nitro is a major upgrade to Arbitrum, improving over "classic" Arbitrum in several ways
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