MetaMask Extension is a non-custodial cryptocurrency wallet that enables users to store, send, and receive Ethereum-based assets, including ERC-20 and ERC-721 tokens. It also serves as a bridge to dApps, allowing users to interact with blockchain networks directly from their web browser. Available as a browser extension for Chrome, Firefox, Edge, and Brave, MetaMask simplifies access to Web3 functionalities without requiring complex technical knowledge.