Bip39 Passphrase. The wallet handles the heavy lifting of converting the mnemonic words through a means of elaborate hashing, salting, and checksum functions into a binary "seed," and that is then used to deliver the all-crucial private and community encryption keys. BIP39 Mnemonic phrase is usually a list of words https://a-listdirectory.com/listings13045353/bip39-word-list-numbers-https-linktr-ee-bip39-the-2-minute-rule-for-bip39-compatible-wallet