AKA Seed Phrase, Mnemonic Phrase. A multi-word phrase (For example, something like “correct-horse-staple-battery…”) which allows a user to recover a lost private key or recover a private key in the case of a forgotten password. This phrase maps directly to the key; no password or connection to the cloud is required if a user (or attacker) has this phrase. Users are encouraged to write these down and hide them in a secure physical location. This is the last line of defense against losing your private key.