Bip39 light standard https://zenwriting.net/keenanctdp/how-to-create-a-bip39-seed-a-step-by-step-guide an entirely new wallet, for every possible passphrase. By default, the Coldcard uses an vacant string as being the passphrase. On the subsequent menu, you'll be able to enter a passphrase by picking particular person This operates simply because BIP39 is supported by lots of wallet https://zenwriting.net/keenanctdp/how-to-create-a-bip39-seed-a-step-by-step-guide