BIP39 stands for Bitcoin Enhancement Proposal 39. The words are chosen from a certain list of 2048 widespread English words which may be used to the create a binary seed (your personal key). This extra complexity improves the hazard of misplacing the passphrase, and therefore getting rid of your copyright. https://doctorbookmark.com/story18850578/the-2-minute-rule-for-bip39-all-words