Web3 is not only a blockchain or cryptocurrency, but also an Internet revolution centered on the redistribution of ownership, privacy, and power. Core technologies include wallets, dApps, DeFi, DAO, NFT, DID, etc., which aim to decentralize and give users data sovereignty. Through smart contracts, token incentives, and multi-field innovations, Web3 is reshaping finance, social networking, identity management, and infrastructure construction, and promoting the Internet to develop in a more democratic and free direction.