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Definition: crypto seed phrase
A group of 12 to 24 everyday words from which a private cryptographic key is created in a crypto wallet maintained by the user. Also called a "recovery phrase" or "secret recovery phrase" (SRP), the words must be written down and stored in a safe place in case the wallet is ever stolen or damaged beyond repair. In that event, the keys can be regenerated from the seed phrase. Otherwise, all the user's cryptocurrency managed by the wallet is gone forever. See crypto wallet.
Optional Passphrase
A passphrase is an extra layer of security that is optional, but not all crypto wallets support it. If used, it must be stored in the same safe place as the seed phrase.
Seed Phrase from MetaMask
Seed Phrase from Electrum
Optional Passphrase
A passphrase is an extra layer of security that is optional, but not all crypto wallets support it. If used, it must be stored in the same safe place as the seed phrase.
MetaMask is an Ethereum wallet that users must keep secure because the wallet generates the private keys to their ether (ETH).
The process is pretty much the same for all wallets. The seed phrase is generated and must be backed up.