What is secret phrase?

Because the private key is composed of 64-bit hexadecimal, which is inconvenient to record and copy. For users' convenience, a secret phrase was generated. It is simplified into a phrase consisting of 12 words, with a space between each word. The secret phrase and private key have the same function, that is, you can import the wallet by entering the secret phrase and setting a new password. Like the private key, a wallet has one set of secret phrases and cannot be modified. Anybody else who discovers the phrase can steal the cryptos, so it must be kept safe like jewels or cash. For example, no one should ask you for it on social networks or messenger, it must not be typed into any website.