Polkadot is a blockchain project that allows for the interconnection of multiple different blockchains. It was founded by the Web3 Foundation, which aims to develop a decentralized web.

In addition to the central Relay Chain, Polkadot uses multiple parallel blockchains, called parachains, to provide interoperability that allows for the exchange of various types of data and value.

Operating blockchains in parallel solves the scalability problem while also increasing safety by pooling the security functions of the parachains into the Relay Chain.