BIP39 means Bitcoin Enhancement Proposal 39. The words are selected from a certain list of 2048 typical English words that may be accustomed to the create a binary seed (your non-public critical). Standard recovery phrases use a particular list of 2048 words next the BIP39 standard (Bitcoin Improvement Proposal 39). https://bookmarkpath.com/story18765786/how-much-you-need-to-expect-you-ll-pay-for-a-good-bip39-seed-phrase-mnemonics-generator