Polkadot is designed to enable cross-blockchain transfers of data and assets by connecting various blockchains into a single, unified network. It features a relay chain and parachains that enhance scalability and security. Polkadot uses a nominated proof-of-stake (NPoS) consensus model to secure its network. Developers can build specialized parachains for different use cases, such as DeFi, NFTs, or gaming, while benefiting from Polkadot’s security and interoperability.