MetaMask is a browser extension that serves as a digital wallet for storing and managing Ethereum and other cryptocurrencies. It allows users to interact with decentralized applications (dApps) directly from their web browser. With MetaMask Extension, users can create or import Ethereum accounts, send and receive cryptocurrency, and view transaction history. It also enables seamless integration with Ethereum-based dApps, facilitating activities such as decentralized finance (DeFi), gaming, and non-fungible token (NFT) trading. MetaMask prioritizes user security by providing features like password protection, seed phrase backup, and network customization. Overall, MetaMask empowers users to explore and engage with the Ethereum ecosystem easily.