BIP39 stands for Bitcoin Advancement Proposal 39. The words are chosen from a selected list of 2048 frequent English words that may be accustomed to the crank out a binary seed (your private critical). This additional complexity raises the risk of misplacing the passphrase, and thus shedding your copyright. BIP44: https://cyberbookmarking.com/story18750647/examine-this-report-on-bip39-mnemonic-phrase-tool