¿Para que sirve el passphrase de una clave ssh?

como quiera esto no nos sirve... gracias

SSH uses private/public key pairs to protect your communication with the server. SSH passphrases protect your private key from being used by someone who doesn't know the passphrase. Without a passphrase, anyone who gains access to your computer has the potential to copy your private key. For example, family members, coworkers, system administrators, and hostile actors could gain access.

A secure passphrase helps keep your private key from being copied and used even if your computer is compromised.