From the MetaMask website, MetaMask is a crypto wallet and gateway to blockchain apps. It is available as a browser extension and as a mobile app, Metamask equips you with a key vault, secure login, token wallet, and token exchange - everything you need to manage your digital assets. MetaMask was created out of the need of creating more secure and usable Ethereum-based websites. In particular, it handles account management and connecting the user to the blockchain.