MetaMask is a cryptocurrency wallet that allows users to interact with the Ethereum blockchain and access decentralized applications (DApps) through a browser extension or mobile app. It is a self-custodial wallet that prioritizes user security and anonymity. MetaMask provides users with a key vault, secure login, token wallet, and token exchange, allowing them to manage their digital assets in a safe and simple way. With over 100 million users worldwide, MetaMask is one of the most popular cryptocurrency wallets available. Users can store and manage account keys, broadcast transactions, send and receive Ethereum-based cryptocurrencies and tokens, and securely connect to decentralized applications through a compatible web browser or the mobile apps built-in browser. MetaMask generates passwords and keys on the users device, ensuring that only they have access to their accounts and data.