A popular digital wallet for Ethereum cryptocurrencies from ConsenSys Software. Introduced in 2016 and available as a mobile app and browser extension for Chrome or Firefox, MetaMask offers a wide variety of tokens to swap. It finds the lowest fees on exchanges that handle the transactions. See Ethereum
and crypto wallet
A Wallet Backup Phrase
MetaMask uses an HD wallet technology that derives the private key from a random group of words. Users have to save this sequence in order to back up their wallet. Anyone knowing these words has access to the coins.