The Vibe: The biggest Ethereum Layer 2 — fast, cheap transactions with Ethereum’s security.
The Details: Arbitrum uses optimistic rollups to scale Ethereum (lower fees, higher speed). Leads L2 TVL (~$2.8–$3B). Upgrades like Stylus (Rust/C++ contracts) coming 2026. ARB token for governance and fees.
Pro Tip: Use for DeFi/NFTs — fees pennies vs Ethereum mainnet. Bridge funds carefully; great for everyday use.