Moonbeam is a developer-oriented blockchain that strives to provide compatibility with the existing Ethereum developer toolchain and network. It does this by providing a full EVM implementation, a Web3-compatible API, and bridges that connect Moonbeam to existing Ethereum networks. This allows developers to deploy existing Solidity smart contracts and DApp frontends to Moonbeam with minimal changes. Moonbeam will also be a parachain on the Polkadot network. That means it will get shared security from the Polkadot relay chain and will be able to integrate with other chains that are connected to Polkadot.
