Base is an Ethereum Layer 2 (L2) network built by Coinbase, using Optimism's OP Stack to provide faster, cheaper transactions for decentralized apps (dApps) while inheriting Ethereum's security, aiming to onboard more users by making Web3 accessible and integrating with Coinbase's ecosystem. It functions as a scalable extension of Ethereum, allowing developers to build easily with EVM compatibility and use ETH for fees, without a native token.