Bip39 Checksum. A BIP39 mnemonic sentence is actually a set of words (most often 12 or 24) that we are able to connect with a lot more correctly than other characters that are not words (bits and numbers and the like). BIP39's purpose in introducing the usage of mnemonic words https://webtalkdirectory.com/listings13097044/bip39-word-list-pdf-https-linktr-ee-bip39-the-greatest-guide-to-bip39-tool