CertiK is a web3 security company that specializes in smart contract auditing and provides a range of security services. Their products include KYC verification, smart contract auditing, bug bounties, incident response, and advisory services. They offer audits for various blockchain ecosystems such as BNB Chain, Ethereum, Avalanche, Solana, Algorand, NEAR, Cosmos, Polygon, and Aptos. CertiK is known for its expertise in web3 security and risk management, helping clients make informed decisions about their investments.