Notitia
Faster, cheaper transactions.
A Layer 2 processes transactions off the main chain (Layer 1) then posts a compressed summary back. The result: far lower fees and high throughput, while inheriting the L1's security.
Rollups (Optimism, Arbitrum, zkSync, Base) dominate: ‘optimistic’ (fraud proofs) or ‘zero-knowledge’ (cryptographic proofs). They have become Ethereum's main highway.
Test your understanding with a quick interactive quiz.