Plonky2 is an advanced recursive SNARK, renowned for being significantly faster than most alternatives. Merging the strengths of PLONK and FRI, it delivers the speed of STARK and the benefits of SNARK, including low-cost Ethereum verification and recursion support. Users only need keccak-256 to verify a proof, and with potential updates like EIP-4488, its Ethereum verification cost could be dramatically reduced.