This tutorial introduces building decentralized applications (dApps) on the Polkadot network, focusing on creating a simple CLI app called "You've Got Mail". Polkadot serves as a multi-chain protocol coordinating different application-specific rollups or parachains, facilitating unique domain-specific logic for each. Developers can leverage Polkadot's SDK to build rollups that inherit the security of the relay chain. Moreover, the use of cross-consensus messaging (XCM) allows for communication between deployed rollups, even integrating with other protocols like Ethereum, thus enhancing interoperability in Web3 applications.
Polkadot's protocol coordinates and secures different rollups, allowing for a horizontally scaling, multi-chain structure essential for Web3.
Once deployed, rollups can communicate with one another using cross-consensus messaging (XCM), enabling interaction with other protocols like Ethereum.
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