MetaMask is a popular cryptocurrency wallet and browser extension that allows users to interact with the Ethereum blockchain and its decentralized applications (dApps) directly from their web browser. It was launched in 2016 by ConsenSys, a blockchain technology company.

MetaMask allows users to create and manage Ethereum accounts, which can be used to send and receive Ether (ETH) and other ERC-20 tokens. It also allows users to connect to various Ethereum dApps and interact with them directly from the browser, without needing to navigate to a separate platform or interface.

One of the key features of MetaMask is its ease of use and user-friendly interface, which makes it accessible to both experienced and novice cryptocurrency users. It also provides users with a high degree of security, including the ability to store private keys locally on their device, as well as the option to add extra layers of security, such as two-factor authentication.

Overall, MetaMask is an important tool for the Ethereum community, as it provides a simple and secure way for users to manage their digital assets and interact with decentralized applications from their web browser. Its popularity has grown significantly in recent years, as the use of decentralized applications and the adoption of cryptocurrencies continue to increase.