BIP39 stands for Bitcoin Improvement Proposal 39. The words are selected from a selected list of 2048 frequent English words that may be accustomed to the create a binary seed (your personal critical). This post clarifies BIP39, the standard that defines how seed phrases are created, and summarizes how BIP32 https://bookmarkdistrict.com/story19354959/the-basic-principles-of-bip39-passphrase-generator