Polkadot protocol is designed to improve the compatibility of various blockchains, such as Bitcoin and Ethereum ones. The protocol is developed by the Parity Technologies team, headed by Gavin Wood, the former Ethereum technical director.
Thus, Polkadot is a protocol that allows independent blockchains to exchange information. Polkadot is an inter-chain blockchain protocol which unlike internet messaging protocols (e.g. TCP/IP) also enforces the order and the validitiy of the messages between the chains. This interoperability also allows the additional benefit of scalability by creating a general environment for multiple state machines.
Now, the development team announces the official launch of the network and the simultaneous launch of a campaign to sell the project's tokens. On top of that, the team also warns about the appearance of a fake site, the creators of which obviously set a goal to steal user funds.
— Polkadot (@polkadotnetwork) October 15, 2017
In total, 5 million DOT tokens are offered for Polkadot network's token sale.