Mantle is a high-performance Ethereum Layer 2 network that combines a rollup with a decentralized data availability layer. It is governed by BitDAO and uses $BIT as its native token. The document introduces Mantle and outlines its key features, including leveraging the Ethereum ecosystem, easy development using familiar EVM tools, and unparalleled builder support through grants, partnerships, and marketing assistance. Developers can build high-performance dApps with low fees, high security, and fast transactions while benefiting from Mantle's modular design and performance optimizations.