Bip39 tool https://jsbin.com/titaniseko As you are able to see, they are normal words that happen to be very easy to retailer or recall. It's not at all recommended to recall them, but it's significantly less difficult than remembering a 64-character-extended string of random numbers and letters. Compared with standard wallets https://thesocialdelight.com/story6001588/bip39-list-github-new-step-by-step-map-for-bip39-github-https-dzen-ru-bip39-phrase-com