BIP39 stands for Bitcoin Advancement Proposal 39. The words are selected from a selected list of 2048 widespread English words which may be accustomed to the crank out a binary seed (your private vital). This additional complexity enhances the possibility of misplacing the passphrase, and so losing your copyright. BIP44: https://telegra.ph/Unlocking-the-World-of-BIP39-A-Comprehensive-Guide-to-Mnemonic-Expressions-and-Word-Listings-01-17