Seed For The Random Number Generator. The seed phrase acts as being a backup with the wallet and can be used to restore the wallet and obtain the money in case of loss or harm to the initial wallet. Though hassle-free, storing your phrase digitally increases the risk of hacking. https://financeyahoo05050.wikilima.com/988378/the_anatomy_of_a_bip39_phrase_entropy_terms_and_security