MetaMask is a popular cryptocurrency wallet and gateway to blockchain applications, primarily known for its ease of use and integration with various decentralized applications (dApps). Launched in 2016 by ConsenSys, MetaMask allows users to manage their Ethereum-based assets, including Ether (ETH) and ERC-20 tokens, through a browser extension and mobile app. It provides secure login, token storage, and transaction management, making it a vital tool for interacting with the decentralized web. MetaMask also features a built-in service to swap tokens, enhancing its utility in the growing decentralized finance (DeFi) ecosystem.