The salt is generally known to the attacker. The point of the salt is that it’s unique for each password hash, making it impossible to run crack attempts on every password at the same time; for a password hash to be checked, the salt has to be retrieved. This means they’re usually stored together and therefore also compromised together; keeping them apart is rarely useful (kind of like peppers, which is what you might be thinking of; they’re per-application rather than per-hash, and their purpose is to be unknown to the attacker, which is equivalent to encrypting things with a per-application key).
The salt is generally known to the attacker. The point of the salt is that it’s unique for each password hash, making it impossible to run crack attempts on every password at the same time; for a password hash to be checked, the salt has to be retrieved. This means they’re usually stored together and therefore also compromised together; keeping them apart is rarely useful (kind of like peppers, which is what you might be thinking of; they’re per-application rather than per-hash, and their purpose is to be unknown to the attacker, which is equivalent to encrypting things with a per-application key).