Also known as a 'Seed Phrase', is a 12-word secret phrase that gives you access to your digital wallet and allows you to authorize cryptocurrency and NFT transactions from your wallet.
To keep your funds safe, you should never share your seed phrase with anyone, just like how you would never share your social security number or bank account password with anyone.
Coinbase Help Center pages related to 'Seed Phrase'
Import an existing wallet - How do I find my recovery phrase?
Sending authenticated account requests for Coinbase Commerce
Coinbase Commerce - Account FAQ - I’ve lost access to my 2-step verification device
Coinbase wallet extension - Connect your Ledger hardware wallet