A Seed Phrase, also known as a recovery phrase or backup phrase, is a series of words that are used to recover the private keys of a self-custody wallet. If a user loses their private keys or their wallet is otherwise inaccessible, the seed phrase can be used to generate a new set of private keys and regain access to the wallet.
Seed phrases are typically made up of 12-24 words, and are generated when a wallet is first created. They are meant to be kept in a secure location, such as a safe or a password-protected digital file. Because seed phrases are the only way to recover the private keys of a wallet, keep them safe and do not share them with anyone.