Polkadot is an open-source sharding multichain protocol that facilitates the cross-chain transfer of any data or asset types, not just tokens, thereby making a wide range of blockchains interoperable with each other.

This interoperability seeks to establish a fully decentralized and private web, controlled by its users, and simplify the creation of new applications, institutions and services.

Cardano is a proof-of-stake blockchain platform that says its goal is to allow “changemakers, innovators and visionaries” to bring about positive global change.

The open-source project also aims to “redistribute power from unaccountable structures to the margins to individuals” — helping to create a society that is more secure, transparent and fair.