BIP39 stands for Bitcoin Advancement Proposal 39. The words are picked from a particular list of 2048 popular English words which may be accustomed to the make a binary seed (your non-public key). This article describes BIP39, the standard that defines how seed phrases are made, and summarizes how BIP32 https://bookmark-template.com/story22683028/bip39-seed-phrase-mnemonics-generator-an-overview