BIP39 stands for Bitcoin Improvement Proposal 39. The words are chosen from a particular list of 2048 frequent English words which may be accustomed to the generate a binary seed (your private important). This additional complexity enhances the threat of misplacing the passphrase, and so getting rid of your copyright. https://captainbookmark.com/story18784124/new-step-by-step-map-for-ledger-seed-phrase-bip39