Most hard wallets come with a seed that can be used to restore your wallet if you end up losing your wallet or it gets stolen. (chainbits.com)
The seed is the only way of restoring the wallet in case of loss or hardware failure. (coindesk.com)
A «master seed» comprising 12 random words generates your wallet address and stays rooted to your device for restoring the wallet balance in emergency situations. (kryptomoney.com)