Polkadot is a multi-chain, heterogeneous, and scalable Blockchain Platform. Allows individual Blockchains to link to build a decentralized network by sharing data.

Simply put, Polkadot is a blockchain made up of several blockchains that allows users to create their own blockchains on top of the Polkadot system. Other businesses can use Multi-chain to create a complete Blockchain system that runs on Polkadot's network. This is similar to ERC-20 tokens that run on the Ethereum network's smart contracts. And this is the Polkadot network's scalability.

Polkadot aims to solve two major Blockchain issues: network interoperability and scalability. Polkadot's (DOT) mission is to build a "Decentralized Web," in which we, not some institution or government, control our identities and data.

Chain of command (Relay chain):
This is where the network's heart beats. The main chain is designed to allow for flexible connections between parachains. The validator will be in charge of safeguarding and administering the network there.

Layer 2 Scaling Solution (Parachain):
Parachain is made up of separate blockchains that are linked to the main chain to maximize the network impact. The results of validation by specified validators are used by Parachain. It works in tandem with a relay chain to take use of the network, greatly accelerating the system's development. To put it another way, this is a form of subchain that is part of the main network.

Bridges
Bridges are a unique type of network called a parachain. Bridges allow the Polkadot ecosystem to communicate with other blockchain protocols such as Ethereum or Bitcoin. For projects that do not require a constant link to the main chain, this is also a cost-effective solution.

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