Polkadot (DOT) is an innovative cryptocurrency that can support multiple blockchains at the same time. Thanks to Polkadot, it is possible to transfer assets between different blockchains located on the network.
The idea of all this is that Polkadot can become a scalability option for networks like Ethereum or other cryptocurrencies. Furthermore, it can also be used to connect different ecosystems on different blockchains, all of which are on the same network.
Polkadot itself does not provide native support for smart contracts. This excludes the creation of tokens or DApps locally on the network.