A BIP39 mnemonic sentence is often a set of words (most often 12 or 24) that we are able to connect with extra successfully than other figures that aren't words (bits and figures along with the like). BIP39's reason in introducing using mnemonic words is to decrease the errors https://friendlybookmark.com/story18534936/bip39-cdn-an-unbiased-view-of-seed-phrase-generator