Web 3 is emerging as a new trend in the development of the Internet and is gradually coming into the public eye. It is based on blockchain technology, achieving decentralization and allowing users to control data and value. In the Web 3 world, smart contracts ensure fair transactions, and decentralized applications change the traditional model. It grants users more power and paves the way for innovation and fairness. However, Web 3 still faces challenges such as technology and regulation, but it has a broad prospect and is expected to reshape the future of the Internet