Metamask is a popular Ethereum wallet that connects to the blockchain and allows users to securely store, send and receive Ether (ETH) and other ERC-20 tokens. It is a browser extension that is available for Chrome, Firefox, Opera, and Brave browsers. Metamask also provides users with the ability to interact with decentralized applications (DApps) on the Ethereum blockchain. It is a great choice for those who want to securely store their cryptocurrency and interact with DApps without having to install a full node on their computer. Additionally, Metamask also provides users with the ability to access their wallet from any device, as long as they have the extension installed.