Polkadot is a heterogeneous multi-chain architecture consisting of decentralized relay chains, parallel chains, and transfer Bridges. Relay chains can host a large number of verifiable, globally consistent dynamic data structures; Parallel chains are independent chains that have flexible functions and can adapt to different environments. They can also have their own consensus mechanism. Their transactions are verified by the validator of the relay chain and added to the central ledger of the relay chain, which can be accessed by other parallel chains. A bridging bridge can connect to an external blockchain. Polkadot was developed under the direction of the Web3 Foundation. Dieter Fishbein, Web3 Foundation Partnership Manager, explains why Polkadot was created: The future blockchain network should not be separated and independent, but needs the interlinkage between different functions of the blockchain, so the platform with interoperability like Boca is needed. In short, Boca chain plays the role of linking all the chains, that is, connecting all the chains. Web 3.0, which is the infrastructure of the next generation of Internet, is also a huge idea, and the development span and difficulty of which are uncertain. The Web 3.0 Foundation was set up, first, to design a concrete structure based on the idea, including the underlying protocols, the second layer of infrastructure, and the next layer of applications. Second, each layer of planning depends on project members within the ecology to achieve, so the Web3 Foundation continues to fund and incubate projects according to the planning. When projects at each level of the ecosystem appear, the shape of Web 3.0 is basically set. Third, Poca's role is to connect these applications or infrastructures into a network and ecosystem.