Polkadot was founded by Dr. Gavin Wood, Robert Habermeier, and Peter Czaban as the flagship protocol of Web3 Foundation, a Swiss nonprofit dedicated to building the decentralized web. Gavin Wood is the most prominent among them as Ethereum co-founder, Parity Technologies founder, and creator of the Solidity programming language, also credited with coining the term Web3. Habermeier is a Thiel Fellow and cryptography researcher, while Czaban formerly served as Web3 Foundation technology director.

Polkadot held its first ICO in October 2017 at a price of $0.29 per DOT with 2.24 million tokens sold, followed by a second ICO in July 2020 at $1.25 per DOT. In August 2020 the network underwent redenomination increasing supply from 10 million to 1 billion tokens. By end of 2021 the first parachain slot auctions concluded with Acala, Moonbeam, Astar, Parallel and Clover winning the initial five slots, each locked for 96 weeks.

Polkadot operates through four core components: the Relay Chain serving as the heart of the network to create consensus, interoperability and shared security; parachains as independent layer-1 chains optimized for specific use cases with their own tokens; parathreads offering flexible pay-as-you-go connectivity; and bridges enabling parachains to communicate with external blockchains like Ethereum. The entire ecosystem is built on the Substrate framework for custom blockchain development.

Following redenomination Polkadot has a total supply of 1 billion DOT tokens with no explicit maximum supply cap. The token serves three roles: staking through NPoS mechanism where nominators back validators to secure the network, on-chain governance giving all token holders voting rights, and bonding to reserve DOT when connecting parachain slots via candle auctions. Annual inflation rate varies based on staking participation levels.

Polkadot employs a highly sophisticated on-chain governance system where all DOT token holders have voting rights. The network uses nominated proof-of-stake where nominators back validators who confirm transactions on the Relay Chain from different parachains. Polkadot can autonomously and forklessly update its own codebase through on-chain governance based on the will of the token holder community, eliminating the need for hard forks when implementing new features or removing bugs.

Polkadot primarily enables cross-chain interoperability allowing different blockchains to trustlessly share information and transactions. Its Substrate framework makes it quick and easy to develop custom parachains for specific use cases. The ecosystem spans DeFi protocols, gaming applications, identity solutions, and infrastructure projects, with parachains like Acala offering decentralized finance services and Moonbeam providing Ethereum compatibility. The network supports creation of new applications, institutions and services in a decentralized manner.