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The MetaMask wallet extension is a browser extension that acts as a gateway to the Ethereum blockchain and the decentralized web. It allows users to securely manage their Ethereum-based cryptocurrencies and interact with decentralized applications (dApps) directly from their web browser. With the MetaMask extension installed, users can easily send and receive Ether (ETH) and ERC-20 tokens, access decentralized exchanges, participate in decentralized finance (DeFi) protocols, and more—all within the familiar environment of their web browser. The extension provides a user-friendly interface, robust security features, and seamless integration with Ethereum-based dApps, making it a popular choice among cryptocurrency enthusiasts.