Polkadot is a next-generation blockchain protocol designed to connect multiple specialized blockchains into a single, unified network. Often called a "blockchain of blockchains," it aims to solve key limitations of older networks like isolation and scalability by enabling different chains to communicate and share security.
This interoperability is achieved through its unique architecture. Polkadot consists of a central Relay Chain for security and consensus, and user-built parallel chains called parachains. These parachains can be customized for specific functions while remaining connected and able to transfer any data or asset across the network.
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Its primary goal is to enable different blockchains to transfer messages and value in a secure, scalable, and trust-free manner, creating an interconnected internet of blockchains.
While Ethereum is a single, general-purpose blockchain, Polkadot is a multi-chain network that allows multiple independent blockchains to run in parallel, each with its own features, while sharing security.
DOT serves three main functions: it is used for network governance (voting on upgrades), staking to secure the network, and bonding to connect new parachains to the network.