MetaMask is the most widely used Ethereum and EVM-compatible blockchain wallet, available as a browser extension (Chrome, Firefox, Brave, Edge) and mobile app (iOS, Android). Developed by ConsenSys and launched in 2016, MetaMask has over 30 million monthly active users. MetaMask generates and stores private keys locally in the browser (encrypted by a password), making it a non-custodial hot wallet. Core functions: connecting to dApps (DeFi protocols, NFT marketplaces) via the MetaMask permission system; managing multiple Ethereum addresses; switching between networks (Ethereum mainnet, Polygon, Arbitrum, Optimism, BNB Chain, and any custom EVM network); sending and receiving tokens; and swapping via MetaMask native swap aggregator. The MetaMask extension injects a web3 provider (window.ethereum) into every webpage, enabling seamless dApp interaction. MetaMask Portfolio provides a unified view across all connected addresses and chains. Key risks: browser extensions are vulnerable to malware; phishing sites mimic MetaMask interface; MetaMask wallets should not store large long-term holdings – hardware wallets (Ledger integration supported) are recommended for significant amounts above $5,000.
Example: Example: A DeFi user visits Uniswap for the first time. They click Connect Wallet, select MetaMask, approve the connection request in the extension popup, and can immediately swap tokens. MetaMask signs the transaction with the local private key and submits it to Ethereum. The entire process takes 10 seconds – no account creation, no email, no KYC required.
Learn more: MetaMask
