Polygon blockchain is a multi-chain scaling solution for Ethereum that enhances transaction speed and reduces fees. Built as a Layer 2 solution, it provides a framework for building decentralized applications (dApps) and enterprise blockchain solutions with scalability and security. Polygon leverages technologies like Plasma and Rollups to improve the performance of Ethereum-based applications, allowing for faster and cheaper transactions. It has gained significant adoption for DeFi, NFTs, and gaming projects, contributing to the growth of the broader Ethereum ecosystem.