Polygon is a cryptocurrency, with the symbol MATIC, and also a technology platform that enables blockchain networks to connect and scale.The Polygon platform operates using the Ethereum blockchain, and connects Ethereum-based projects. Polygon also operates a hybrid Proof of Stake and Plasma sidechains. DApps and tokens from Ethereum can be deployed on the Polygon Network for increased throughput and scaling. Polygon is a sustainable blockchain - see here for energy consumption.