A BIP39 mnemonic sentence is usually a set of words (most often 12 or 24) that we can communicate with more correctly than other figures that are not words (bits and numbers as well as like). BIP39's goal in introducing using mnemonic words is usually to reduce the problems https://1001bookmarks.com/story18518815/seed-phrase-generator-5-easy-facts-about-seed-phrase-generator-described