Bip39 Add Private Key A BIP39 mnemonic sentence is really a set of words (most commonly twelve or 24) that we are able to connect with far more correctly than other characters that are not words (bits and quantities as well as like). BIP39's goal in introducing using mnemonic words https://socialaffluent.com/story4010103/seed-for-the-random-number-generator-indicators-on-seed-phrase-generator-you-should-know