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The magic of the wallet. Bip-32 standard.
Lets say you live in a country full of war-lords, who steal from you and you cant walk down the street without getting robbed.
You need to pay a bill at a local store but dont want to bring cash or credit or even your Ledger, what do you do? Use your “Brain wallet” memorize your seed phrase!
You walk to the place and get frisked by the war-lords and you have nothing on you. You walk up to the counter and they hand you a Ledger. You enter the wrong pin 3 times and the device asks you to verify your words. You enter your 24 words seed phrase and magically, your wallet is now in the Ledger! You proceed to pay your bill. After, you enter the wrong pin 3 times and hand it back to the cashier who enters the 24 word seed phrase of the till, wiping yours from the device, and give you a receipt.
Its magical like that